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页面一
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 <html>
 <head>
 <title>java 登录界面</title>
 <meta name="keywords" content="java 登录界面" />
 <meta name="viewport" content="width=device-width, initial-scale=1">
 <link href="style.css" rel='stylesheet' type='text/css' />
 </head>
 <body>
 <h1>欢迎进入java 登录界面</h1>
 <div class="registration">
 <div class="form-info">
 <form>
 <h2>xxx 登录 </h2>
 <input type="text" class="text" placeholder="用户名" required="" />
 <input type="password" class="Password" placeholder="密码" required="" />
 <div class="btn"><input type="submit" value="登录"></div>
 <div class="roundedOne">
 <input type="checkbox" value="None" id="roundedOne" name="check" />
 <label for="roundedOne"> </label>
 <p>记住密码</p>
 </div>
 </form>
 <div class="clear"> </div>
 </div>
 </div>
 </body>
 </html>
- css - 1 
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 459- /* reset */ 
 html,body,div,span,applet,object,iframe,h1,h2,h3,h4,h5,h6,p,blockquote,pre,a,abbr,acronym,address,big,cite,code,del,dfn,em,img,ins,kbd,q,s,samp,small,strike,strong,sub,sup,tt,var,b,u,i,dl,dt,dd,ol,nav ul,nav li,fieldset,form,label,legend,table,caption,tbody,tfoot,thead,tr,th,td,article,aside,canvas,details,embed,figure,figcaption,footer,header,hgroup,menu,nav,output,ruby,section,summary,time,mark,audio,video{margin:0;padding:0;border:0;font-size:100%;font:inherit;vertical-align:baseline;}
 article, aside, details, figcaption, figure,footer, header, hgroup, menu, nav, section {display: block;}
 ol,ul{list-style:none;margin:0px;padding:0px;}
 blockquote,q{quotes:none;}
 blockquote:before,blockquote:after,q:before,q:after{content:'';content:none;}
 table{border-collapse:collapse;border-spacing:0;}
 /* start editing from here */
 a{text-decoration:none;}
 .txt-rt{text-align:right;}/* text align right */
 .txt-lt{text-align:left;}/* text align left */
 .txt-center{text-align:center;}/* text align center */
 .float-rt{float:right;}/* float right */
 .float-lt{float:left;}/* float left */
 .clear{clear:both;}/* clear float */
 .pos-relative{position:relative;}/* Position Relative */
 .pos-absolute{position:absolute;}/* Position Absolute */
 .vertical-base{ vertical-align:baseline;}/* vertical align baseline */
 .vertical-top{ vertical-align:top;}/* vertical align top */
 nav.vertical ul li{ display:block;}/* vertical menu */
 nav.horizontal ul li{ display: inline-block;}/* horizontal menu */
 img{max-width:100%;}
 /*end reset*/
 body {
 font-family:Verdana;
 background: url("../images/bg.jpg") no-repeat 0px 0px;
 
 text-align: center;
 background-size:cover;
 -webkit-background-size:cover;
 -moz-background-size:cover;
 -o-background-size:cover;
 height: 888px;
 }
 .wrap{
 margin: 0 auto;
 width: 90%;
 }
 body a,form li,input[type="submit"],input[type="text"],.sixth-login input[type="submit"],.third-login input[type="submit"]{
 transition: 0.1s all;
 -webkit-transition: 0.1s all;
 -moz-transition: 0.1s all;
 -o-transition: 0.1s all;
 }
 h1 {
 
 color: #FFFFFF;
 font-size: 3em;
 font-weight: 600;
 padding-top: 1em;
 }
 h2 {
 
 text-align: left;
 color: #4b86e7;
 font-size: 1.5em;
 font-weight: 300;
 margin-bottom: 20px;
 }
 .registration {
 background: #fff;
 width: 22%;
 margin: 2% auto 0;
 padding: 1.5em;
 }
 .form-info {
 width: 100%;
 margin: 0 auto;
 }
 input.text {
 outline: none;
 background: none;
 color: #999;
 width: 93%;
 padding: 12px;
 border: 1px solid#DDD;
 font-size: 1em;
 font-weight: 100;
 margin-bottom: 1.5em;
 box-shadow: 1px 1px 8px 2px #D6D6D6;
 -webkit-box-shadow: 1px 1px 8px 2px #D6D6D6;
 -moz-box-shadow: 1px 1px 8px 2px #D6D6D6;
 -o-box-shadow: 1px 1px 8px 2px #D6D6D6;
 }
 input[type="password"]{
 outline: none;
 background: none;
 color: #999;
 width: 93%;
 padding: 12px;
 border: 1px solid#DDD;
 font-size: 1em;
 font-weight: 100;
 margin-bottom: 1.5em;
 box-shadow: 1px 1px 8px 2px #D6D6D6;
 -webkit-box-shadow: 1px 1px 8px 2px #D6D6D6;
 -moz-box-shadow: 1px 1px 8px 2px #D6D6D6;
 -o-box-shadow: 1px 1px 8px 2px #D6D6D6;
 }
 input[type="submit"] {
 outline: none;
 border: none;
 background: #73e74b;
 color: #fff;
 width: 100%;
 padding: 10px 25px;
 font-size: 1.2em;
 font-weight: 400;
 cursor: pointer;
 }
 input[type="submit"]:hover {
 background: #4fd0db;
 transition: 1s all;
 -webkit-transition: 1s all;
 -moz-transition: 1s all;
 -o-transition: 1s all;
 }
 input#slideThree {
 display: none;
 }
 .roundedOne p{
 margin: 6px 0 0 36px;
 font-size: 13px;
 color: #999;
 width: 100px;
 }
 .btn{
 float: right;
 }
 /*--checkbox--*/
 .roundedOne {
 width: 28px;
 height: 28px;
 background: #fcfff4;
 background: -webkit-linear-gradient(top, #fcfff4 0%, #dfe5d7 40%, #b3bead 100%);
 background: -moz-linear-gradient(top, #fcfff4 0%, #dfe5d7 40%, #b3bead 100%);
 background: -o-linear-gradient(top, #fcfff4 0%, #dfe5d7 40%, #b3bead 100%);
 background: -ms-linear-gradient(top, #fcfff4 0%, #dfe5d7 40%, #b3bead 100%);
 background: linear-gradient(top, #fcfff4 0%, #dfe5d7 40%, #b3bead 100%);
 filter: progid:DXImageTransform.Microsoft.gradient( startColorstr='#fcfff4', endColorstr='#b3bead',GradientType=0 );
 margin: 20px auto;
 -webkit-border-radius: 50px;
 -moz-border-radius: 50px;
 border-radius: 50px;
 -webkit-box-shadow: inset 0px 1px 1px white, 0px 1px 3px rgba(0,0,0,0.5);
 -moz-box-shadow: inset 0px 1px 1px white, 0px 1px 3px rgba(0,0,0,0.5);
 box-shadow: inset 0px 1px 1px white, 0px 1px 3px rgba(0,0,0,0.5);
 position: relative;
 left: 3px;
 top: -12px;
 float: left;
 }
 .roundedOne label {
 cursor: pointer;
 position: absolute;
 width: 20px;
 height: 20px;
 -webkit-border-radius: 50px;
 -moz-border-radius: 50px;
 border-radius: 50px;
 left: 4px;
 top: 4px;
 -webkit-box-shadow: inset 0px 1px 1px rgba(0,0,0,0.5), 0px 1px 0px rgba(255,255,255,1);
 -moz-box-shadow: inset 0px 1px 1px rgba(0,0,0,0.5), 0px 1px 0px rgba(255,255,255,1);
 box-shadow: inset 0px 1px 1px rgba(0,0,0,0.5), 0px 1px 0px rgba(255,255,255,1);
 background: -webkit-linear-gradient(top, #fff 0%, #fff 100%);
 background: -moz-linear-gradient(top, #fff 0%, #fff 100%);
 background: -o-linear-gradient(top, #fff 0%, #fff 100%);
 background: -ms-linear-gradient(top, #fff 0%, #fff 100%);
 background: linear-gradient(top, #fff 0%, #fff 100%);
 filter: progid:DXImageTransform.Microsoft.gradient( startColorstr='#222', endColorstr='#45484d',GradientType=0 );
 }
 .roundedOne label:after {
 -ms-filter: "progid:DXImageTransform.Microsoft.Alpha(Opacity=0)";
 filter: alpha(opacity=0);
 opacity: 0;
 content: '';
 position: absolute;
 width: 16px;
 height: 16px;
 background: #4b86e7;
 background: -webkit-linear-gradient(top, #4b86e7 0%, #4b86e7 100%);
 background: -moz-linear-gradient(top, #4b86e7 0%, #4b86e7 100%);
 background: -o-linear-gradient(top, #4b86e7 0%, #4b86e7 100%);
 background: -ms-linear-gradient(top, #4b86e7 0%, #4b86e7 100%);
 background: linear-gradient(top, #4b86e7 0%, #4b86e7 100%);
 -webkit-border-radius: 50px;
 -moz-border-radius: 50px;
 border-radius: 50px;
 top: 2px;
 left: 2px;
 -webkit-box-shadow: inset 0px 1px 1px white, 0px 1px 3px rgba(0,0,0,0.5);
 -moz-box-shadow: inset 0px 1px 1px white, 0px 1px 3px rgba(0,0,0,0.5);
 box-shadow: inset 0px 1px 1px white, 0px 1px 3px rgba(0,0,0,0.5);
 }
 .roundedOne input[type=checkbox]:checked + label:after {
 -ms-filter: "progid:DXImageTransform.Microsoft.Alpha(Opacity=100)";
 filter: alpha(opacity=100);
 opacity: 1;
 }
 input#roundedOne {
 display: none;
 }
 /*--/checkbox--*/
 .strip {
 background: url("../images/strip.png") no-repeat 13px 8px;
 width: 349px;
 height: 22px;
 display: block;
 margin-bottom: 1em;
 position: relative;
 }
 .strip span {
 background: #FFFFFF;
 padding: 8px;
 border-radius: 50px;
 font-size: 18px;
 color: #DEDEDE;
 position: absolute;
 top: -55%;
 left: 45%;
 }
 /*--bottom-icons--*/
 ul.bottom-sc-icons {
 list-style: none;
 margin: 0;
 padding: 0;
 }
 ul.bottom-sc-icons li {
 display: inline-block;
 margin: 25px 0 18px;
 }
 a.facebook {
 background: #34579b;
 color: #fff;
 padding: 18px 142px 18px 20px;
 font-size: 14px;
 border-radius: 3px;
 -webkit-border-radius: 3px;
 -moz-border-radius: 3px;
 -o-border-radius: 3px;
 -ms-border-radius: 3px;
 font-weight: 400;
 }
 a.twitter {
 background: #269df9;
 color: #fff;
 padding: 18px 151px 18px 16px;
 font-size: 14px;
 border-radius: 3px;
 -webkit-border-radius: 3px;
 -moz-border-radius: 3px;
 -o-border-radius: 3px;
 -ms-border-radius: 3px;
 font-weight: 400;
 }
 a.facebook img {
 vertical-align: middle;
 margin-right: 20px;
 }
 a.twitter img {
 vertical-align: middle;
 margin-right: 16px;
 }
 a.facebook:hover {
 background: #1B3E81;
 transition: 1s all;
 -webkit-transition: 1s all;
 -moz-transition: 1s all;
 -o-transition: 1s all;
 border-radius:0;
 }
 a.twitter:hover {
 background: #1E5681;
 transition: 1s all;
 -webkit-transition: 1s all;
 -moz-transition: 1s all;
 -o-transition: 1s all;
 border-radius:0;
 }
 /*--/bottom-icons--*/
 .copy-rights {
 padding: 4em 0;
 }
 .copy-rights p {
 color:#fff;
 }
 .copy-rights p a {
 color:#fff;
 }
 .copy-rights p a:hover {
 color:#73e74b;
 }
 /*--start-responsive-design--*/
 @media (max-width:1440px){
 a.facebook {
 padding: 18px 132px 18px 20px;
 }
 a.twitter {
 padding: 18px 143px 18px 16px;
 }
 .strip span {
 left: 44%;
 }
 .registration {
 width: 24%;
 }
 }
 @media (max-width:1366px){
 a.facebook {
 padding: 18px 120px 18px 16px;
 }
 a.twitter {
 padding: 18px 127px 18px 16px;
 }
 .strip {
 background: url("../images/strip.png") no-repeat 1px 8px;
 width: 323px;
 }
 }
 @media (max-width:1280px){
 a.facebook {
 padding: 18px 95px 18px 16px;
 }
 a.twitter {
 padding: 18px 103px 18px 16px;
 }
 .strip {
 background: url("../images/strip.png") no-repeat 0 8px;
 width: 299px;
 background-size: 100%;
 }
 }
 @media (max-width:1024px){
 .registration {
 width: 30%;
 }
 .strip {
 background: url("../images/strip.png") no-repeat 6px 8px;
 width: 308px;
 background-size: 97%;
 }
 body {
 font-family:Verdana;
 height: 675px;
 }
 .copy-rights {
 padding: 2em 0 1em;
 }
 a.facebook {
 padding: 18px 100px 18px 16px;
 }
 a.twitter {
 padding: 18px 105px 18px 16px;
 }
 }
 @media (max-width:768px){
 body {
 font-family:Verdana;
 height: 929px;
 }
 .registration {
 width: 40%;
 }
 h1 {
 padding-top: 3em;
 }
 a.facebook {
 padding: 18px 105px 18px 16px;
 }
 a.twitter {
 padding: 18px 112px 18px 16px;
 }
 .strip {
 width: 308px;
 }
 }
 @media (max-width:640px){
 .registration {
 width: 50%;
 }
 .strip {
 background: url("../images/strip.png") no-repeat 6px 8px;
 width: 311px;
 background-size: 97%;
 }
 a.facebook {
 padding: 18px 107px 18px 16px;
 }
 a.twitter {
 padding: 18px 114px 18px 16px;
 }
 }
 @media (max-width:480px){
 .registration {
 width: 70%;
 }
 a.facebook {
 padding: 18px 121px 18px 16px;
 }
 a.twitter {
 padding: 18px 127px 18px 16px;
 }
 .strip {
 background: url("../images/strip.png") no-repeat 6px 8px;
 width: 325px;
 background-size: 98%;
 }
 }
 @media (max-width:320px){
 h1 {
 font-size: 2em;
 padding-top: .5em;
 }
 .registration {
 width: 80%;
 padding: 1em;
 }
 input.text {
 width: 90%;
 margin-bottom: 1em;
 }
 input[type="password"] {
 width: 90%;
 }
 .roundedOne {
 margin: 12px auto 0;
 }
 .strip span {
 padding: 6px;
 font-size: 14px;
 top: -19%;
 left: 42%;
 }
 input[type="submit"] {
 padding: 8px 17px;
 font-size: 16px;
 }
 .strip {
 background: url("../images/strip.png") no-repeat 6px 8px;
 width: 243px;
 background-size: 97%;
 margin: 10px 0 7px;
 }
 a.facebook {
 padding: 18px 39px 18px 16px;
 }
 a.twitter {
 padding: 16px 45px 16px 15px;
 }
 body {
 font-family:Verdana;
 height: 545px;
 }
 .copy-rights {
 padding: 1.5em 0 1em;
 }
 }
- image
  
- 效果图
  
页面二
- html - 1 
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 <html>
 <head>
 <meta charset="utf-8">
 <title></title>
 <style>
 * {
 margin: 0;
 padding: 0;
 box-sizing: border-box;
 }
 body {
 height: 100vh;
 }
 .Box {
 position: fixed;
 top: 50%;
 left: 50%;
 transform: translate(-50%, -50%);
 width: 550px;
 height: 330px;
 display: flex;
 }
 form {
 position: absolute;
 top: 50%;
 left: 50%;
 transform: translate(-50%, -60%);
 width: 80%;
 text-align: center;
 }
 h3 {
 font-size: 28px;
 margin-bottom: 20px;
 letter-spacing: 5px;
 color: #fff;
 }
 input {
 width: 100%;
 height: 38px;
 border: 2px solid #ffffff;
 background-color: transparent;
 padding-left: 10px;
 font-size: 12px;
 color: #ffffff;
 margin-bottom: 15px;
 outline: none;
 }
 input::placeholder {
 color: #fff;
 }
 .desc {
 margin: 0px 20px 30px;
 text-align: center;
 font-size: 12px;
 color: #d6d6d6;
 }
 .loginBtn {
 cursor: pointer;
 width: 100%;
 line-height: 36px;
 text-align: center;
 font-size: 15px;
 color: #000000;
 background: rgb(255, 255, 255);
 outline: none;
 border: none;
 margin-top: 10px;
 transition: all 0.1s;
 }
 .loginBtn:hover {
 border: #000000 1px solid;
 font-weight: 550;
 letter-spacing: 6px;
 }
 .no {
 display: flex;
 justify-content: space-between;
 cursor: pointer;
 text-align: center;
 font-size: 12px;
 color: #c6c6c6;
 }
 </style>
 </head>
 <body>
 <div class="Box">
 <form action="">
 <h3>欢迎登录</h3>
 <p class="desc">WELCOME LOGIN</p>
 <input type="text" placeholder="请输入账号" required>
 <input type="password" placeholder="请输入密码" required>
 <input type="submit" class="loginBtn" value="立即登录"></button>
 <p class="no">
 <span>忘记密码</span>
 <span>没有账号?立即注册</span>
 </p>
 </form>
 </div>
 <!-- 静态svg背景 -->
 <svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 1920 1080"><g transform="
 rotate(0 960 540)
 translate(-0 -0)
 scale(1)
 "><rect width="1920" height="1080" fill="rgb(237, 194, 194)"></rect><g transform="translate(0, 0)"><path fill="rgb(199, 169, 178)" fill-opacity="1" d="M0,352.943L45.714,350.075C91.429,347.207,182.857,341.471,274.286,340.581C365.714,339.692,457.143,343.65,548.571,344.095C640,344.54,731.429,341.472,822.857,303.183C914.286,264.894,1005.714,191.383,1097.143,185.175C1188.571,178.967,1280,240.06,1371.429,221.336C1462.857,202.612,1554.286,104.069,1645.714,98.48C1737.143,92.892,1828.571,180.258,1874.286,223.941L1920,267.624L1920,1080L1874.286,1080C1828.571,1080,1737.143,1080,1645.714,1080C1554.286,1080,1462.857,1080,1371.429,1080C1280,1080,1188.571,1080,1097.143,1080C1005.714,1080,914.286,1080,822.857,1080C731.429,1080,640,1080,548.571,1080C457.143,1080,365.714,1080,274.286,1080C182.857,1080,91.429,1080,45.714,1080L0,1080Z"></path></g><g transform="translate(0, 360)"><path fill="rgb(161, 143, 161)" fill-opacity="1" d="M0,136.093L45.714,117.434C91.429,98.774,182.857,61.455,274.286,80.719C365.714,99.983,457.143,175.829,548.571,189.505C640,203.181,731.429,154.687,822.857,130.414C914.286,106.141,1005.714,106.09,1097.143,141.274C1188.571,176.458,1280,246.877,1371.429,284.697C1462.857,322.517,1554.286,327.739,1645.714,284.675C1737.143,241.611,1828.571,150.263,1874.286,104.589L1920,58.914L1920,720L1874.286,720C1828.571,720,1737.143,720,1645.714,720C1554.286,720,1462.857,720,1371.429,720C1280,720,1188.571,720,1097.143,720C1005.714,720,914.286,720,822.857,720C731.429,720,640,720,548.571,720C457.143,720,365.714,720,274.286,720C182.857,720,91.429,720,45.714,720L0,720Z"></path></g><g transform="translate(0, 720)"><path fill="rgb(123, 118, 145)" fill-opacity="1" d="M0,107.121L45.714,134.307C91.429,161.493,182.857,215.866,274.286,254.33C365.714,292.794,457.143,315.35,548.571,300.514C640,285.679,731.429,233.452,822.857,180.313C914.286,127.174,1005.714,73.123,1097.143,43.365C1188.571,13.606,1280,8.141,1371.429,41.079C1462.857,74.017,1554.286,145.358,1645.714,167.782C1737.143,190.206,1828.571,163.713,1874.286,150.467L1920,137.221L1920,360L1874.286,360C1828.571,360,1737.143,360,1645.714,360C1554.286,360,1462.857,360,1371.429,360C1280,360,1188.571,360,1097.143,360C1005.714,360,914.286,360,822.857,360C731.429,360,640,360,548.571,360C457.143,360,365.714,360,274.286,360C182.857,360,91.429,360,45.714,360L0,360Z"></path></g></g></svg>
 </body>
 </html>
- 效果图  
动态背景
- html - 1 
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 <html>
 <head>
 <meta charset="utf-8">
 <title></title>
 <script src="https://cdn.jsdelivr.net/npm/bubbly-bg@0.2.3/dist/bubbly-bg.js"></script>
 <style>
 * {
 margin: 0;
 padding: 0;
 box-sizing: border-box;
 }
 body {
 height: 100vh;
 }
 .Box {
 position: fixed;
 top: 50%;
 left: 50%;
 transform: translate(-50%, -50%);
 width: 550px;
 height: 330px;
 display: flex;
 }
 form {
 position: absolute;
 top: 50%;
 left: 50%;
 transform: translate(-50%, -60%);
 width: 80%;
 text-align: center;
 }
 h3 {
 font-size: 28px;
 margin-bottom: 20px;
 letter-spacing: 5px;
 color: #fff;
 }
 input {
 width: 100%;
 height: 38px;
 border: 2px solid #ffffff;
 background-color: transparent;
 padding-left: 10px;
 font-size: 12px;
 color: #ffffff;
 margin-bottom: 15px;
 outline: none;
 }
 input::placeholder {
 color: #fff;
 }
 .desc {
 margin: 0px 20px 30px;
 text-align: center;
 font-size: 12px;
 color: #d6d6d6;
 }
 .loginBtn {
 cursor: pointer;
 width: 100%;
 line-height: 36px;
 text-align: center;
 font-size: 15px;
 color: #000000;
 background: rgb(255, 255, 255);
 outline: none;
 border: none;
 margin-top: 10px;
 transition: all 0.1s;
 }
 .loginBtn:hover {
 border: #000000 1px solid;
 font-weight: 550;
 letter-spacing: 6px;
 }
 .no {
 display: flex;
 justify-content: space-between;
 cursor: pointer;
 text-align: center;
 font-size: 12px;
 color: #c6c6c6;
 }
 </style>
 </head>
 <body>
 <div class="Box">
 <form action="">
 <h3>欢迎登录</h3>
 <p class="desc">WELCOME LOGIN</p>
 <input type="text" placeholder="请输入账号" required>
 <input type="password" placeholder="请输入密码" required>
 <input type="submit" class="loginBtn" value="立即登录"></button>
 <p class="no">
 <span>忘记密码</span>
 <span>没有账号?立即注册</span>
 </p>
 </form>
 </div>
 </body>
 </html>
 <script>
 // 动态背景 这个背景也是使用了一个库文件bubbly-bg,代码中的js部分有注释,气泡的颜色也可以自己调整更换
 
 // 蓝色
 bubbly();
 // 紫色
 // bubbly({
 // colorStart: "#4c004c",
 // colorStop: "#1a001a",
 // bubbleFunc: () => `hsla(${Math.random() * 360}, 100%, 50%, ${Math.random() * 0.25})`
 // });
 // Black/red
 // bubbly({
 // colorStart: "#111",
 // colorStop: "#422",
 // bubbleFunc: () => `hsla(0, 100%, 50%, ${Math.random() * 0.25})`
 // });
 </script>
- 效果图 
  
页面四
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 <html lang="en">
 <head>
 <meta charset="UTF-8">
 <meta name="viewport" content="width=device-width, initial-scale=1.0">
 <title>Document</title>
 <style>
 * {
 margin: 0;
 padding: 0;
 }
 html {
 height: 100%;
 }
 body {
 height: 100%;
 }
 .container {
 height: 100%;
 background-image: linear-gradient(to right, #fbc2eb, #a6c1ee);
 }
 .login-wrapper {
 background-color: #fff;
 width: 358px;
 height: 588px;
 border-radius: 15px;
 padding: 0 50px;
 position: relative;
 left: 50%;
 top: 50%;
 transform: translate(-50%, -50%);
 }
 .header {
 font-size: 38px;
 font-weight: bold;
 text-align: center;
 line-height: 200px;
 }
 .input-item {
 display: block;
 width: 100%;
 margin-bottom: 20px;
 border: 0;
 padding: 10px;
 border-bottom: 1px solid rgb(128, 125, 125);
 font-size: 15px;
 outline: none;
 }
 .input-item:placeholder {
 text-transform: uppercase;
 }
 .btn {
 text-align: center;
 padding: 10px;
 width: 100%;
 margin-top: 40px;
 background-image: linear-gradient(to right, #a6c1ee, #fbc2eb);
 color: #fff;
 }
 .msg {
 text-align: center;
 line-height: 88px;
 }
 a {
 text-decoration-line: none;
 color: #abc1ee;
 }
 </style>
 </head>
 <body>
 <div class="container">
 <div class="login-wrapper">
 <div class="header">Login</div>
 <div class="form-wrapper">
 <input type="text" name="username" placeholder="username" class="input-item">
 <input type="password" name="password" placeholder="password" class="input-item">
 <div class="btn">Login</div>
 </div>
 <div class="msg">
 Don't have account?
 <a href="#">Sign up</a>
 </div>
 </div>
 </div>
 </body>
 </html>
- 效果图  
页面五
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 <html lang="en">
 <head>
 <meta charset="UTF-8">
 <meta name="viewport" content="width=device-width, initial-scale=1.0">
 <title>Document</title>
 <style>
 body {
 background: url('https://cdn.pixabay.com/photo/2018/08/14/13/23/ocean-3605547_1280.jpg') no-repeat;
 background-size: 100% 130%;
 }
 #login_box {
 width: 20%;
 height: 400px;
 background-color: #00000060;
 margin: auto;
 margin-top: 10%;
 text-align: center;
 border-radius: 10px;
 padding: 50px 50px;
 }
 h2 {
 color: #ffffff90;
 margin-top: 5%;
 }
 #input-box {
 margin-top: 5%;
 }
 span {
 color: #fff;
 }
 input {
 border: 0;
 width: 60%;
 font-size: 15px;
 color: #fff;
 background: transparent;
 border-bottom: 2px solid #fff;
 padding: 5px 10px;
 outline: none;
 margin-top: 10px;
 }
 button {
 margin-top: 50px;
 width: 60%;
 height: 30px;
 border-radius: 10px;
 border: 0;
 color: #fff;
 text-align: center;
 line-height: 30px;
 font-size: 15px;
 background-image: linear-gradient(to right, #30cfd0, #330867);
 }
 #sign_up {
 margin-top: 45%;
 margin-left: 60%;
 }
 a {
 color: #b94648;
 }
 </style>
 </head>
 <body>
 <div id="login_box">
 <h2>LOGIN</h2>
 <div id="input_box">
 <input type="text" placeholder="请输入用户名">
 </div>
 <div class="input_box">
 <input type="password" placeholder="请输入密码">
 </div>
 <button>登录</button><br>
 </div>
 </body>
 </html>
- 效果图  
页面六
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 <html lang="en">
 <head>
 <meta charset="UTF-8">
 <meta name="viewport" content="width=device-width, initial-scale=1.0">
 <title>Document</title>
 <style>
 * {
 padding: 0;
 margin: 0;
 }
 html {
 height: 100%;
 }
 body {
 background-image: linear-gradient(to bottom right, rgb(186 191 218), rgb(156 118 203));
 }
 .login-container {
 width: 600px;
 height: 320px;
 margin: 0 auto;
 margin-top: 15%;
 border-radius: 15px;
 box-shadow: 0 10px 50px 0 rbg(59, 45, 159);
 background-color: rgb(95, 76, 194);
 }
 .left-container {
 display: inline-block;
 width: 330px;
 border-top-left-radius: 15px;
 border-bottom-left-radius: 15px;
 padding: 60px;
 background-image: linear-gradient(to bottom right, rgb(118, 76, 163), rgb(92, 103, 211));
 }
 .title {
 color: #fff;
 font-size: 18px;
 font-weight: 200;
 }
 .title span {
 border-bottom: 3px solid rgb(237, 221, 22);
 }
 .input-container {
 padding: 20px 0;
 }
 input {
 border: 0;
 background: none;
 outline: none;
 color: #fff;
 margin: 20px 0;
 display: block;
 width: 100%;
 padding: 5px 0;
 transition: .2s;
 border-bottom: 1px solid rgb(199, 191, 219);
 }
 input:hover {
 border-bottom-color: #fff;
 }
 ::-webkit-input-placeholder {
 color: rgb(199, 191, 219);
 }
 .message-container {
 font-size: 14px;
 transition: .2s;
 color: rgb(199, 191, 219);
 cursor: pointer;
 }
 .message-container:hover {
 color: #fff;
 }
 .right-container {
 width: 144px;
 display: inline-block;
 height: calc(100% - 120px);
 vertical-align: top;
 padding: 60px 0;
 }
 .regist-container {
 text-align: center;
 color: #fff;
 font-size: 18px;
 font-weight: 200;
 }
 .regist-container span {
 border-bottom: 3px solid rgb(237, 221, 22);
 }
 .action-container {
 font-size: 10px;
 color: #fff;
 text-align: center;
 position: relative;
 top: 200px;
 }
 .action-container span {
 border: 1px solid rgb(237, 221, 22);
 padding: 10px;
 display: inline;
 line-height: 20px;
 border-radius: 20px;
 position: absolute;
 bottom: 10px;
 left: calc(72px - 20px);
 transition: .2s;
 cursor: pointer;
 }
 .action-container span:hover {
 background-color: rgb(237, 221, 22);
 color: rgb(95, 76, 194);
 }
 </style>
 </head>
 <body>
 <div class="login-container">
 <div class="left-container">
 <div class="title"><span>登录</span></div>
 <div class="input-container">
 <input type="text" name="username" placeholder="用户名">
 <input type="password" name="password" placeholder="密码">
 </div>
 <div class="message-container">
 <span>忘记密码</span>
 </div>
 </div>
 <div class="right-container">
 <div class="regist-container">
 <span class="regist">注册</span>
 </div>
 <div class="action-container">
 <span>提交</span>
 </div>
 </div>
 </div>
 </body>
 </html>
- 效果图 
  
页面七
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 <html lang="en">
 <head>
 <meta charset="UTF-8">
 <meta name="viewport" content="width=device-width, initial-scale=1.0">
 <title>Document</title>
 <style>
 * {
 margin: 0;
 padding: 0;
 }
 a {
 text-decoration: none;
 }
 input,
 button {
 background: transparent;
 border: 0;
 outline: none;
 }
 body {
 height: 100vh;
 background: linear-gradient(#141e30, #243b55);
 display: flex;
 justify-content: center;
 align-items: center;
 font-size: 16px;
 color: #03e9f4;
 }
 .loginBox {
 width: 400px;
 height: 364px;
 background-color: #0c1622;
 margin: 100px auto;
 border-radius: 10px;
 box-shadow: 0 15px 25px 0 rgba(0, 0, 0, .6);
 padding: 40px;
 box-sizing: border-box;
 }
 h2 {
 text-align: center;
 color: aliceblue;
 margin-bottom: 30px;
 font-family: 'Courier New', Courier, monospace;
 }
 .item {
 height: 45px;
 border-bottom: 1px solid #fff;
 margin-bottom: 40px;
 position: relative;
 }
 .item input {
 width: 100%;
 height: 100%;
 color: #fff;
 padding-top: 20px;
 box-sizing: border-box;
 }
 .item input:focus+label,
 .item input:valid+label {
 top: 0px;
 font-size: 2px;
 }
 .item label {
 position: absolute;
 left: 0;
 top: 12px;
 transition: all 0.5s linear;
 }
 .btn {
 padding: 10px 20px;
 margin-top: 30px;
 color: #03e9f4;
 position: relative;
 overflow: hidden;
 text-transform: uppercase;
 letter-spacing: 2px;
 left: 35%;
 }
 .btn:hover {
 border-radius: 5px;
 color: #fff;
 background: #03e9f4;
 box-shadow: 0 0 5px 0 #03e9f4,
 0 0 25px 0 #03e9f4,
 0 0 50px 0 #03e9f4,
 0 0 100px 0 #03e9f4;
 transition: all 1s linear;
 }
 .btn>span {
 position: absolute;
 }
 .btn>span:nth-child(1) {
 width: 100%;
 height: 2px;
 background: -webkit-linear-gradient(left, transparent, #03e9f4);
 left: -100%;
 top: 0px;
 animation: line1 1s linear infinite;
 }
 @keyframes line1 {
 50%,
 100% {
 left: 100%;
 }
 }
 .btn>span:nth-child(2) {
 width: 2px;
 height: 100%;
 background: -webkit-linear-gradient(top, transparent, #03e9f4);
 right: 0px;
 top: -100%;
 animation: line2 1s 0.25s linear infinite;
 }
 @keyframes line2 {
 50%,
 100% {
 top: 100%;
 }
 }
 .btn>span:nth-child(3) {
 width: 100%;
 height: 2px;
 background: -webkit-linear-gradient(left, #03e9f4, transparent);
 left: 100%;
 bottom: 0px;
 animation: line3 1s 0.75s linear infinite;
 }
 @keyframes line3 {
 50%,
 100% {
 left: -100%;
 }
 }
 .btn>span:nth-child(4) {
 width: 2px;
 height: 100%;
 background: -webkit-linear-gradient(top, transparent, #03e9f4);
 left: 0px;
 top: 100%;
 animation: line4 1s 1s linear infinite;
 }
 @keyframes line4 {
 50%,
 100% {
 top: -100%;
 }
 }
 </style>
 </head>
 <body>
 <div class="loginBox">
 <h2>login</h2>
 <form action="">
 <div class="item">
 <input type="text" required>
 <label for="">userName</label>
 </div>
 <div class="item">
 <input type="password" required>
 <label for="">password</label>
 </div>
 <button class="btn">submit
 <span></span>
 <span></span>
 <span></span>
 <span></span>
 </button>
 </form>
 </div>
 </body>
 </html>
- 效果图 
  
页面八
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 <html lang="en">
 <!-- https://codepen.io/danielkvist/pen/LYNVyPL -->
 <head>
 <meta charset="UTF-8">
 <meta name="viewport" content="width=device-width, initial-scale=1.0">
 <title>Document</title>
 <style>
 :root {
 /* COLORS */
 --white: #e9e9e9;
 --gray: #333;
 --blue: #0367a6;
 --lightblue: #008997;
 /* RADII */
 --button-radius: 0.7rem;
 /* SIZES */
 --max-width: 758px;
 --max-height: 420px;
 font-size: 16px;
 font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Oxygen,
 Ubuntu, Cantarell, "Open Sans", "Helvetica Neue", sans-serif;
 }
 body {
 align-items: center;
 background-color: var(--white);
 background: url("https://image.baidu.com/search/detail?ct=503316480&z=0&ipn=d&word=%E8%B5%B5%E4%B8%BD%E9%A2%96%E5%A3%81%E7%BA%B8%E5%8F%AF%E7%88%B1&step_word=&hs=0&pn=3&spn=0&di=7375936315981824001&pi=0&rn=1&tn=baiduimagedetail&is=0%2C0&istype=0&ie=utf-8&oe=utf-8&in=&cl=2&lm=-1&st=undefined&cs=3670744027%2C1817706741&os=2963643813%2C92161588&simid=4238305459%2C712646005&adpicid=0&lpn=0&ln=1928&fr=&fmq=1722750623985_R&fm=&ic=undefined&s=undefined&hd=1&latest=0©right=0&se=&sme=&tab=0&width=undefined&height=undefined&face=undefined&ist=&jit=&cg=&bdtype=0&oriquery=&objurl=https%3A%2F%2Fi0.hdslb.com%2Fbfs%2Farchive%2Fdf9d8ff0623d536b2e8ff5782dc737656c13e86a.jpg&fromurl=ippr_z2C%24qAzdH3FAzdH3F4_z%26e3Bktstktst_z%26e3Bv54AzdH3Fet1j5AzdH3FBV8bQ9y810UvAzdH3F&gsm=78&rpstart=0&rpnum=0&islist=&querylist=&nojc=undefined&dyTabStr=MCwzLDEsMiwsNyw2LDUsMTIsOQ%3D%3D&lid=10667070774753633817");
 /* 决定背景图像的位置是在视口内固定,或者随着包含它的区块滚动。*/
 /* https://developer.mozilla.org/zh-CN/docs/Web/CSS/background-attachment */
 background-attachment: fixed;
 background-position: center;
 background-repeat: no-repeat;
 background-size: cover;
 display: grid;
 height: 100vh;
 place-items: center;
 }
 .form__title {
 font-weight: 300;
 margin: 0;
 margin-bottom: 1.25rem;
 }
 .link {
 color: var(--gray);
 font-size: 0.9rem;
 margin: 1.5rem 0;
 text-decoration: none;
 }
 .container {
 background-color: var(--white);
 border-radius: var(--button-radius);
 box-shadow: 0 0.9rem 1.7rem rgba(0, 0, 0, 0.25),
 0 0.7rem 0.7rem rgba(0, 0, 0, 0.22);
 height: var(--max-height);
 max-width: var(--max-width);
 overflow: hidden;
 position: relative;
 width: 100%;
 }
 .container__form {
 height: 100%;
 position: absolute;
 top: 0;
 transition: all 0.6s ease-in-out;
 }
 .container--signin {
 left: 0;
 width: 50%;
 z-index: 2;
 }
 .container.right-panel-active .container--signin {
 transform: translateX(100%);
 }
 .container--signup {
 left: 0;
 opacity: 0;
 width: 50%;
 z-index: 1;
 }
 .container.right-panel-active .container--signup {
 animation: show 0.6s;
 opacity: 1;
 transform: translateX(100%);
 z-index: 5;
 }
 .container__overlay {
 height: 100%;
 left: 50%;
 overflow: hidden;
 position: absolute;
 top: 0;
 transition: transform 0.6s ease-in-out;
 width: 50%;
 z-index: 100;
 }
 .container.right-panel-active .container__overlay {
 transform: translateX(-100%);
 }
 .overlay {
 background-color: var(--lightblue);
 background: url("https://cdn.pixabay.com/photo/2018/08/14/13/23/ocean-3605547_1280.jpg");
 background-attachment: fixed;
 background-position: center;
 background-repeat: no-repeat;
 background-size: cover;
 height: 100%;
 left: -100%;
 position: relative;
 transform: translateX(0);
 transition: transform 0.6s ease-in-out;
 width: 200%;
 }
 .container.right-panel-active .overlay {
 transform: translateX(50%);
 }
 .overlay__panel {
 align-items: center;
 display: flex;
 flex-direction: column;
 height: 100%;
 justify-content: center;
 position: absolute;
 text-align: center;
 top: 0;
 transform: translateX(0);
 transition: transform 0.6s ease-in-out;
 width: 50%;
 }
 .overlay--left {
 transform: translateX(-20%);
 }
 .container.right-panel-active .overlay--left {
 transform: translateX(0);
 }
 .overlay--right {
 right: 0;
 transform: translateX(0);
 }
 .container.right-panel-active .overlay--right {
 transform: translateX(20%);
 }
 .btn {
 background-color: var(--blue);
 background-image: linear-gradient(90deg, var(--blue) 0%, var(--lightblue) 74%);
 border-radius: 20px;
 border: 1px solid var(--blue);
 color: var(--white);
 cursor: pointer;
 font-size: 0.8rem;
 font-weight: bold;
 letter-spacing: 0.1rem;
 padding: 0.9rem 4rem;
 text-transform: uppercase;
 transition: transform 80ms ease-in;
 }
 .form>.btn {
 margin-top: 1.5rem;
 }
 .btn:active {
 transform: scale(0.95);
 }
 .btn:focus {
 outline: none;
 }
 .form {
 background-color: var(--white);
 display: flex;
 align-items: center;
 justify-content: center;
 flex-direction: column;
 padding: 0 3rem;
 height: 100%;
 text-align: center;
 }
 .input {
 background-color: #fff;
 border: none;
 padding: 0.9rem 0.9rem;
 margin: 0.5rem 0;
 width: 100%;
 }
 @keyframes show {
 0%,
 49.99% {
 opacity: 0;
 z-index: 1;
 }
 50%,
 100% {
 opacity: 1;
 z-index: 5;
 }
 }
 </style>
 </head>
 <body>
 <div class="container right-panel-active">
 <!-- Sign Up -->
 <div class="container__form container--signup">
 <form action="#" class="form" id="form1">
 <h2 class="form__title">Sign Up</h2>
 <input type="text" placeholder="User" class="input" />
 <input type="email" placeholder="Email" class="input" />
 <input type="password" placeholder="Password" class="input" />
 <button class="btn">Sign Up</button>
 </form>
 </div>
 <!-- Sign In -->
 <div class="container__form container--signin">
 <form action="#" class="form" id="form2">
 <h2 class="form__title">Sign In</h2>
 <input type="email" placeholder="Email" class="input" />
 <input type="password" placeholder="Password" class="input" />
 <a href="#" class="link">Forgot your password?</a>
 <button class="btn">Sign In</button>
 </form>
 </div>
 <!-- Overlay -->
 <div class="container__overlay">
 <div class="overlay">
 <div class="overlay__panel overlay--left">
 <button class="btn" id="signIn">Sign In</button>
 </div>
 <div class="overlay__panel overlay--right">
 <button class="btn" id="signUp">Sign Up</button>
 </div>
 </div>
 </div>
 </div>
 <script>
 const signInBtn = document.getElementById("signIn");
 const signUpBtn = document.getElementById("signUp");
 const fistForm = document.getElementById("form1");
 const secondForm = document.getElementById("form2");
 const container = document.querySelector(".container");
 signInBtn.addEventListener("click", () => {
 container.classList.remove("right-panel-active");
 });
 signUpBtn.addEventListener("click", () => {
 container.classList.add("right-panel-active");
 });
 fistForm.addEventListener("submit", (e) => e.preventDefault());
 secondForm.addEventListener("submit", (e) => e.preventDefault());
 </script>
 </body>
 </html>
- 效果图 
  
页面九
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 <html lang="en">
 <head>
 <meta charset="UTF-8" />
 <meta http-equiv="X-UA-Compatible" content="IE=edge" />
 <meta name="viewport" content="width=device-width, initial-scale=1.0" />
 <title>Document</title>
 <!-- <link rel="stylesheet" href="text.css" /> -->
 </head>
 <style>
 .all {
 width: 800px;
 box-shadow: -10px 10px 25px rgba(210, 210, 210, 0.9);
 margin: auto;
 margin-top: 5%;
 display: flex;
 border-radius: 35px;
 background-color: #ffffff;
 height: 550px;
 }
 .log {
 width: 50%;
 margin: auto;
 }
 .reg {
 width: 50%;
 height: 100%;
 margin: auto;
 background-color: #20b2aa;
 border-radius: 35px;
 color: #ffffff;
 }
 .reg_1 {
 text-align: center;
 margin: auto;
 margin-top: 50%;
 }
 .reg_1 h2 {
 font-weight: 700;
 }
 .reg_1 p {
 margin: 15px 0px 25px 0px;
 }
 .sig {
 width: 70px;
 height: 30px;
 border-radius: 12px;
 background-color: #20b2aa;
 border-color: #fff;
 color: #ffffff;
 }
 #tiao {
 padding: 0em 0;
 }
 .reg_1 a {
 color: #ffffff;
 }
 h3 {
 font-size: 3em;
 color: black;
 padding-bottom: 1em;
 margin: 0;
 text-align: center;
 font-family: "Marvel-Regular";
 }
 .input {
 margin: 10px 50px;
 width: 300px;
 height: 70px;
 }
 span {
 color: #999;
 font-size: 0.85em;
 padding-bottom: 0.2em;
 display: block;
 text-transform: uppercase;
 margin-bottom: 4px;
 }
 .input-text {
 border: 1px solid #555;
 outline-color: #fd9f3e;
 width: 90%;
 font-size: 1em;
 padding: 0.5em;
 line-height: inherit;
 }
 .register-top-grid {
 color: black;
 padding-bottom: 1em;
 margin: 0;
 font-family: "Marvel-Regular";
 margin: 10px 0;
 }
 .text-center {
 text-align: center;
 }
 .tijiao {
 color: rgb(255, 253, 253);
 width: 80px;
 height: 35px;
 background-color: rgb(241, 52, 10);
 border: none;
 }
 </style>
 <body>
 <div class="all">
 <div class="log">
 <div class="register">
 <form>
 <div class="register-top-grid">
 <h3>用户登录</h3>
 <div class="input">
 <span>用户名 <label style="color: red">* </label></span>
 <input
 type="text"
 v-model="name"
 placeholder="请输入用户名"
 class="input-text"
 />
 </div>
 <div class="input">
 <span>密码 <label style="color: red">*</label></span>
 <input
 type="password"
 v-model="password"
 placeholder="请输入密码"
 class="input-text"
 />
 </div>
 </div>
 <div class="text-center">
 <input
 type="submit"
 value="提交"
 class="tijiao"
 @click="denglu"
 />
 </div>
 </form>
 </div>
 </div>
 <div class="reg">
 <div class="reg_1">
 <h2>没有账号?</h2>
 <p>立即注册加入我们吧,和我们一起开启旅程吧</p>
 <a href="/register.html">
 <button type="primary" class="sig">注册</button>
 </a>
 </div>
 </div>
 </div>
 </body>
 </html>
- 效果图
  
页面十
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 <html>
 <head>
 <meta charset="utf-8" />
 <title></title>
 <link rel="stylesheet" href="css/style.css" />
 <style>
 
 /*设置底色*/
 *{
 margin: 0;
 padding: 0;
 font-size: 黑体;
 box-sizing: border-box;
 }
 body{
 display: flex;
 justify-content: center;
 align-items: center;
 min-height: 100vh;
 background: #222;
 }
 /*设置登录盒子的大小和底色*/
 .box{
 position:relative;
 width: 380px;
 height: 420px;
 background: #1c1c1c;
 border-radius: 8px;
 }
 /*开启flex布局,换轴*/
 .box form{
 position:absolute;
 inset:4px;
 background: #222;
 padding: 50px 40px;
 border-radius: 8px;
 z-index: 2;
 display: flex;
 flex-direction: column;
 }
 /*标题文字样式,输入框盒子大小间距*/
 .box form h2{
 color: #fff;
 font-weight: 500;
 text-align: center;
 letter-spacing: 0.lem;
 }
 .box form .inputBox{
 position: relative;
 width: 300px;
 margin-top: 35px;
 }
 /*调整输入框样式*/
 .box form .inputBox input{
 position: relative;
 width: 100%;
 padding: 20px 10px 10px;
 background: transparent;
 outline: none;
 border: none;
 box-shadow: none;
 color: #23242;
 font-size: 1em;
 letter-spacing: 0.05em;
 z-index: 10;
 }
 /*提示文字样式*/
 .box form .inputBox span{
 position: absolute;
 left: 0;
 padding: 20px 0px 10px;
 pointer-events: none;
 color: #8f8f8f;
 font-size: 1em;
 letter-spacing: 0.05em;
 }
 /*输入有效值获取焦点时样式*/
 .box form .inputBox input{
 transition: 0.5s;
 }
 .box form .inputBox span{
 transition: 0.5s;
 }
 .box form .inputBox input:valid~span,
 .box form .inputBox input:focus~span{
 color: #fff;
 font-size: 0.75em;
 transform: translateY(-34px);
 }
 /*设置白色下划线,并设置点击穿透*/
 .box form .inputBox i{
 position: absolute;
 left: 0;
 bottom: 0;
 width: 100%;
 height: 2px;
 background: #fff;
 border-radius: 4px;
 overflow: hidden;
 transition: 0.5s;
 pointer-events: none;
 }
 /*输入有效值获取焦点时样式*/
 .box form .inputBox input:valid~i,
 .box form .inputBox input:focus~i{
 height: 44px;
 }
 /*开启flex a链接样式*/
 .box form .links{
 display: flex;
 justify-content: space-between;
 }
 .box form .links a{
 margin: 10px 0;
 font-size: 0.75em;
 color: #8f8f8f;
 text-decoration: none;
 }
 /*a链接hover时改颜色,注册直接改颜色*/
 .box form .links a:hover,
 .box form .links a:nth-child(2){
 color: #fff;
 }
 /*修改登录按钮样式*/
 .box form input[type="submit"]{
 border: none;
 outline: none;
 padding: 9px 25px;
 background: #fff;
 cursor: pointer;
 font-size: 0.9em;
 border-radius: 4px;
 font-weight: 600;
 width: 100px;
 margin-top: 10px;
 }
 /*登录按钮点击时,透明度80%*/
 .box form input[type="submit"]:active{
 opacity: 0.8;
 }
 /*写动画*/
 .borderLine{
 position: absolute;
 top:0;
 inset:0;
 }
 @keyframes animate{
 0%{
 transform: rotate(0deg);
 }
 100%{
 transform: rotate(360deg);
 }
 }
 /*添加动画*/
 .box::before,
 .box::after,
 .borderLine::before,
 .borderLine::after{
 content: "";
 position: absolute;
 top:-50%;
 width: 380px;
 height: 420px;
 background:linear-gradient(
 0deg,transparent,transparent,
 #45f3ff,#45f3ff,#45f3ff);
 z-index: 1;
 transform-origin: bottom right;
 animation: animate 6s linear infinite;
 }
 /*添加动画延迟,修改为两种颜色*/
 .box::after{
 animation-delay: -3s;
 }
 .borderLine::before{
 background: linear-gradient(
 0deg,transparent,transparent,
 #ff2770,#ff2770,#ff2770);
 animation-delay: -1.5s;
 }
 .borderLine::after{
 background: linear-gradient(
 0deg,transparent,transparent,
 #ff2770,#ff2770,#ff2770);
 animation-delay: -4.5s;
 }
 /*退出隐藏*/
 .box{
 overflow: hidden;
 }
 </style>
 </head>
 <body>
 <div class="box">
 <span class="borderLine"></span>
 <form>
 <h2>登录</h2>
 <div class="inputBox">
 <input type="text" required="required" />
 <span>账号:</span><i></i>
 </div>
 <div class="inputBox">
 <input type="password" required="required" />
 <span>密码:</span><i></i>
 </div>
 <div class="links">
 <a href="#">忘记密码</a><a href="#">注册</a>
 </div>
 <input type="submit" value="登录">
 </form>
 </div>
 </body>
 </html>
 
- 效果图
  
 
         
              