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表单与css
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Original
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由于过于生疏还不太理解，写的不好，请老师谅解！

  1. <!DOCTYPE html>
  2. <html lang="en">
  3. <head>
  4.     <meta charset="UTF-8">
  5.     <meta name="viewport" content="width=device-width, initial-scale=1.0">
  6.     <title>表单css</title>
  7.     <style>
  8.         /* 样式初始化 reset.css */
  9.       * {
  10.         margin: 0;
  11.         padding: 0;
  12.         box-sizing: border-box;
  13.       }
  14.       a {
  15.         color: #555;
  16.         text-decoration: none;
  17.       }
  18.         /* 基本选择器 */
  19.         body{
  20.             background-color: rgb(0, 162, 255);
  21.         }
  22.         /* 上下文选择器 */
  23.         em + li {
  24.                 background-color: blueviolet; 
  25.         }
  28.     </style>
  29. </head>
  32. <body>
  33.     <!-- 标题 -->
  34.     <h3 align="center">用户登陆</h3>
  35.     <form action="">
  36.         <!-- 表单分组 -->
  37.       <fieldset align="center" >
  38.           <ul>
  40.           <li>
  43.           <div>
  44.             <div>
  45.                 <label for="username">帐号:</label>
  46.                 <input
  47.                   type="text"
  48.                   id="username"
  49.                   name="username"
  50.                   autofocus
  51.                   required
  52.                   placeholder="登陆账户"
  53.                   value="username"
  54.                 />
  55.               </div>
  57.           </div>
  58.         </li>
  60.         <li>
  61.             <div>
  62.                 <label for="psw">密码:</label>
  63.                 <input type="password" id="psw" name="psw" required placeholder="不少于6位" />
  64.                 <!-- <button type="button" onclick="document.querySelector('#psw').type='text'">显示密码</button> -->
  65.               </div>
  66.         </li>
  69.           <li class="em">
  70.             <div>
  71.                 <div>
  72.                     <label for="email">邮箱:</label>
  73.                     <input type="email" id="email" name="email" required placeholder="deml@email.com" class="em"/>
  74.                   </div>
  75.               </div>
  76.           </li>
  79.           <li >
  80.             <button>登陆</button>
  81.           </li>
  85.         </ul> 
  88.       </fieldset>
  91.     </form>
  92. </body>
  93. </html>

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Correcting teacher：PHPzPHPz

Correction status：qualified

Teacher's comments：
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