如何用CSS实现自适应正方形

实现方式一：  padding 设置百分比 是相对于父元素的

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <meta http-equiv="X-UA-Compatible" content="ie=edge">
  <title>CSS</title>

  <style>
   
    .div2{
      width: 50%;
      padding-bottom: 50%;
      background-color: pink;
    }
  </style>
</head>
<body>
    <div class="div2"></div>
</body>
</html>

　　实现方式二：  通过设置高度单位为 vw

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <meta http-equiv="X-UA-Compatible" content="ie=edge">
  <title>CSS</title>

  <style>
   *{
     margin: 0;
     padding: 0;
   }
    .div2{
      width: 50%;
      height: 50vw;
      background-color: pink;
    }
  </style>
</head>
<body>
    <div class="div2"></div>
</body>
</html>

　　实现方式三：

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <meta http-equiv="X-UA-Compatible" content="ie=edge">
  <title>CSS</title>

  <style>
   *{
     margin: 0;
     padding: 0;
   }
   .div1{
     width: 50%;
     overflow: hidden;
     background-color: pink;
   }
  .div2{
    margin: 100%;
  }
  </style>
</head>
<body>
  <div class="div1">
    <div class="div2"></div>
  </div>
</body>
</html>

　　

posted @ 2019-12-25 14:37  XLLANG  阅读(215)  评论(0)    收藏  举报