小编Aaz*_*zib的帖子

<head>
    <style>
        #container {
            width: 500px;
            margin: 0 auto;
            border: 1px solid #000;
        }

        #first {
            float: left;
        }

        #second {
            float: right:
        }
    </style>
</head>
<body>
    <div id="container">
        <div id="first">
            <p>first</p>
        </div>
        <div id="second">
            <p>second</p>
        </div>
    </div>
</body>