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<title>利用box-sizing实现div仿框架</title>
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* { margin:0; padding:0;}
html { -webkit-box-sizing:border-box; -moz-box-sizing:border-box; box-sizing:border-box; padding:100px 0; overflow:hidden;}
html,body { height:100%;}
.top { position:relative; margin-top:-100px; height:100px; background:#f60;}