lovecoding
/
VIP20


			
				
					
						
						
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							<!DOCTYPE html>
<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>
  <style>
    *{
      margin: 0;
      padding: 0;
    }
    #div1{
      background: red;
      /* width: 50%;
      height: 100px; */
      /* width: 50vw;
      height: 50vw; */

      width: 100%;
      /* height: 50px; */
      padding-top: 50%;

      /* padding-top  百分比  相对于 父元素的宽度 */
      /* 
      960宽度      540高度
      100%         56%
      */
    }
  </style>
</head>
<body>
  <div id="div1"></div>
</body>
</html>