CSS margin 左右间距示例

<html>
  <head>
    <meta charset="utf-8">
    <title>CSS margin 示例</title>
    <style>
      
      .box {
        color: white;
        width: 200px;
        height: 100px;
        padding: 15px;
        float: left;
      }
      .box1 {
        background-color: #4CAF50;
        margin-right: 20px;
      }
      .box2 {
        background-color: #2196F3;
        margin-left: 40px;
      }
    </style>
  </head>
  <body>
    <div class="box box1">div1: margin-right: 20px</div>