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媒体查询实例（手机为先）
vbokok
Original
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  1. <!DOCTYPE html>
  2. <html lang="zh-CN">
  3. <head>
  4.   <meta charset="UTF-8">
  5.   <meta http-equiv="X-UA-Compatible" content="IE=edge">
  6.   <meta name="viewport" content="width=device-width, initial-scale=1.0">
  7.   <title>媒体查询</title>
  8. </head>
  9. <body>
  10.   <button class="btn small">btn1</button>
  11.   <button class="btn middle">btn2</button>
  12.   <button class="btn large">btn3</button>
  13. </body>
  14. </html>
  15. <style>
  16.   html {
  17.     font-size: 0.625rem;
  18.   }
  20.   .btn {
  21.     background-color: rebeccapurple;
  22.     color: white;
  23.     border: none;
  24.     outline: auto;
  25.   }
  26.   .btn:hover {
  27.     cursor: pointer;
  28.     opacity: 0.7;
  29.     transition: 0.4s;
  30.   }
  31.   .btn.small {
  32.     font-size: 1.4rem;
  33.   }
  34.   .btn.middle {
  35.     font-size: 1.8rem;
  36.   }
  37.   .btn.large {
  38.     font-size: 2.2rem;
  39.   }
  41.   @media (max-width: 375px) {
  42.     html{
  43.       font-size: 14px;
  44.     }
  45.   }
  46.    @media (min-width: 375px) and (max-width: 600px) {
  47.     html{
  48.       font-size: 17px;
  49.     }
  50.   }
  51.    @media (min-width: 600px) {
  52.     html{
  53.       font-size: 20px;
  54.     }
  55.   }
  56. </style>

Correcting teacher：PHPzPHPz

Correction status：qualified

Teacher's comments：可以添加一些自己的总结内容
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