清除浮动

方法1

<div className="divcss5"> 
    <div className="divcss5-left">left浮动</div> 
    <div className="divcss5-right">right浮动</div> 
    <div class="clear"></div>

.divcss5{ width:400px;border:1px solid #F00;background:#FF0} 
.divcss5-left,.divcss5-right{width:180px;height:100px; 
border:1px solid #00F;background:#FFF} 
.divcss5-left{ float:left} 
.divcss5-right{ float:right} 
.clear{ clear:both}

方法2

 <div className="divcss5"> 
    <div className="divcss5-left">left浮动</div> 
    <div className="divcss5-right">right浮动</div> 
  </div>

.divcss5{ width:400px;border:1px solid #F00;background:#FF0; overflow:hidden} 
.divcss5-left,.divcss5-right{width:180px;height:100px;
border:1px solid #00F;background:#FFF} 
.divcss5-left{ float:left} 
.divcss5-right{ float:right}