css笔记-4/ 实现圆角矩形和阴影怎么做?

<!DOCTYPE html>
<html>
<head>
  <meta charset="utf-8">
  <title>JS Bin</title>
</head>
  <style>
    #div1{
      border-radius: 20px;
      background: green;
      padding: 20px; 
      width: 300px;
      height: 100px;   
    }
    #div2{
      margin-top:20px;
      width:300px;
      height:100px;
      background-color:blue;
      box-shadow: 10px 10px 3px #888888; 
    }
  </style>
<body>

  <div id="div1"></div>
  <div id="div2"></div>
</body>
</html>