<div class="mod clearfix"> <div class="ml" > <p>左侧定宽</p> </div> <div class="mr"> <div class="modcon"> <p>右侧自适应</p> </div> </div> </div>
.ml{float:left; width:190px;margin-right:-190px;} .mr{} .mr .modcon{margin-left:210px;}