【CSS3动画】下拉菜单模拟

下拉菜单模拟效果图：

CSS3：

        <style>
            #box{width:200px; height:50px; overflow:hidden; cursor: pointer; transition: all 0.35s;}
            #box:hover{height:250px;}
            #box ul{list-style:none; margin:0; padding:0;}
            #box ul li{width:198px; height:48px; line-height: 50px; text-align: center; border:1px red solid; background:#000000; color:white;}
        </style>

HTML：

<!DOCTYPE html>
<html>
    <head>
        <meta charset="UTF-8">
        <title></title>
    </head>
    <body>
        <div id="box">
            <ul>
                <li>This's 1</li>
                <li>This's 2</li>
                <li>This's 3</li>
                <li>This's 4</li>
                <li>This's 5</li>
            </ul>
        </div>
    </body>
</html>

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