<!DOCTYPE html><html><head><title>2</title><style>.box{width:920px;height:300px;background:gray;margin:0 auto;}.box>div.left{width:450px;height:300px;background:red;float:left;} .box>div.right{width:450px;height:300px;background:blue;float:left;} </style> </head><body><div class="box"><div class="left">left</div><div class="right">right</div></div></body></html>
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