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给边框加颜色
南鸢离梦的博客
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937 people have browsed it
  1. <!DOCTYPE html>
  2. <html>
  3. <head>
  4.     <title>\</title>
  5. </head>
  6. <style type="text/css">
  7.     .info{
  8.             width: 296px;
  9.             height: 180px;
  10.             margin: 20px auto;
  11.             position: relative;  /*父相*/
  12.         }
  13.         .info:hover::before{  /*鼠标经过之后 前面插入一个伪元素*/
  14.             content: '';
  15.             width: 100%;
  16.             height: 100%;
  17.             border: 10px solid rgba(201, 255, 209, 0.4);
  18.             display: block; /*转换块级元素 伪元素属于行内元素*/
  19.             position: absolute; /*要伪元素不占位，就用绝对定位*/   /*子绝父相*/
  20.             top: 0;
  21.             left: 0;
  22.             box-sizing: border-box; /*把加入border padding 都算在宽里面*/
  23.         }
  24. </style>
  25. <body>
  26. <div>
  27.         <img src="../images/SuCai/RLs.jpg" height="180" width="296"/>
  28.     </div>
  29.     <div>
  30.         <img src="../images/SuCai/RLs.jpg" height="180" width="296"/>
  31.     </div>
  32.     <div>
  33.         <img src="../images/SuCai/RLs.jpg" height="180" width="296" class="info" />
  34.     </div>
  35. </body>
  36. </html>
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