#content-main .main-content-box {width:1200px;margin:0 auto;min-height:500px;}
#content-main .main-content-box .center-content-box {width:100%;overflow:hidden;}

#content-main .main-content-box .left-content-box {float:left;width:898px;overflow:hidden;} 
#content-main .main-content-box .left-side-box {float:left;width:275px;overflow:hidden;} 

#content-main .main-content-box .right-content-box {float:right;width:898px;overflow:hidden;} 
#content-main .main-content-box .right-side-box {float:right;width:275px;overflow:hidden;}