一般代码-未底部对齐：

<style type="text/css">
.box1 {border:1px #cccccc solid;  width:500px; height:600px;}
.box2 {border-top:1px #cccccc solid; border-bottom:0; background:#f2f6fb; width:500px; height:22px;}
</style>
<div class="box1">
    <div class="box2"></div>
</div>

底部对齐的代码：

<style type="text/css">
.box1 {border:1px #cccccc solid;  width:500px; height:600px;position:relative;}
.box2 {border-top:1px #cccccc solid; background:#f2f6fb; width:498px; height:22px; position:absolute; bottom:0;}
</style>
<div class="box1">
    <div class="box2"></div>
</div>