等高1
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<meta charset="UTF-8">
<title>Document</title>
<style>
#container2 { clear:left; float:left; width:100%; overflow:hidden; background:#ffa7a7; /* column 2 background colour */}#container1 { float:left; width:100%; position:relative; right:50%; background:#fff689; /* column 1 background colour */}#col1 { float:left; width:46%; position:relative; left:52%; overflow:hidden;}#col2 { float:left; width:46%; position:relative; left:56%; overflow:hidden;}
</style>
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<body>
<div id="container2">
<div id="container1">
<div id="col1">
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</div>
<div id="col2">
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</div>
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</body>
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原文：http://my.oschina.net/glelaine/blog/341970