<style>
.box{width: 400px;height: 200px;background-color: #e4f1fb;overflow: hidden;}
.nav{display: inline-block;*display: inline;zoom: 1;}
</style>
<div class="box">
<div class="nav">11111</div>
<div class="nav">22222</div>
</div>
<style>
.box{width: 400px;height: 200px;background-color: #e4f1fb;overflow: hidden;}
.nav{display: inline-block;*display: inline;zoom: 1;}
</style>
<div class="box">
<div class="nav">11111</div>
<div class="nav">22222</div>
</div>