middle 比左右俩边 底一点
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.left{ width:200px; height:500px; background:#ccc;position: absolute; left:0 ;top:0}
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<div class="left">200px</div>
<div class="middle"> 参赛队是对手防守对方分的气氛如果辅导费干的其二个人风格俄方高度撒旦古典风格按时到岗梵蒂冈时代风格地方个时发过去啊的股市大幅杀跌分的发生辅导费发点阿飞阿斯分大是大非 </div>
<div class="right">300px</div>
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