<div class="header">header
div> <div class="main"> <div class="center"> <div class="inner">inner
div>
div> <div class="left">left
div> <div class="right">right
div>
div> <div class="footer">footer
div>
.inner{ margin-left: 150px; margin-right: 100px; }

.main{ background-color: rgb(23,50,77); overflow: hidden; } .left{ width: 150px; background-color: rgb(227,230,195); float: left; margin-left: -100%; padding-bottom: 9999px; margin-bottom: -9999px; } .right{ width: 100px; background-color: rgb(153,77,82); float: left; margin-left: -100px;/*就是width*/ padding-bottom: 9999px; margin-bottom: -9999px; } .center{ background-color: rgb(230,180,80); width: 100%; float: left; padding-bottom: 9999px; margin-bottom: -9999px; } .inner{ margin-left: 150px; margin-right: 100px; }

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