<style>.box{margin:0px auto;border:5px solid pink;}/*只有div有寬度時margin—auto才有效果*/ .box div{float:left;width:100px;} .left{background:red;} .left div{height:150px;border:1px solid #fff;} .center{background:green;} .center div{height:100px;border:1px solid #fff;} .right{background:yellow;} .right div{height:150px;border:1px solid #fff;} .clearfix:after{content:"";display:block;clear:both;height:0;}</style></head><body><div class="box clearfix"> <div class="left">? ? <div></div>? ? ? ? <div></div>? ? </div>? ? <div class="center">? ? <div></div>? ? ? ? <div></div>? ? ? ? <div></div>? ? </div>? ? <div class="right">? ? <div></div>? ? ? ? <div></div>? ? </div></div></body><style>.box{margin:0px auto;border:5px solid pink;}/*只有div有寬度時margin—auto才有效果*/ .box div{float:left;width:100px;} .left{background:red;} .left div{height:150px;border:1px solid #fff;} .center{background:green;} .center div{height:100px;border:1px solid #fff;} .right{background:yellow;} .right div{height:150px;border:1px solid #fff;} .clearfix:after{content:"";display:block;clear:both;height:0;}</style></head><body><div class="box clearfix"> <div class="left">? ? <div></div>? ? ? ? <div></div>? ? </div>? ? <div class="center">? ? <div></div>? ? ? ? <div></div>? ? ? ? <div></div>? ? </div>? ? <div class="right">? ? <div></div>? ? ? ? <div></div>? ? </div></div></body>
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