CSS margin 居右示例

<html>
  <head>
    <meta charset="utf-8">
    <title>CSS margin居右示例</title>
    <style>
      .flex-box {
        width: 750px;
        border: 1px solid #ccc;
      }
      .item {
        margin-left: auto;
        width: 100px;
        height: 50px;
        background-color: #2196F3;
      }
    </style>
  </head>
  <body>
    <div class="flex-box">
      <div class="item">item1</div>
    </div>
  </body>
</html>