.float{clear:both;}
#wrapper{width:920px;height:800px;background:#B9E2F9;}
#header{width:100%;height:120px;background:#81269F;}
.content_area{background:#809BEC;}
#left_sidebar{width:200px;height:600px;background:#800040;float:left;}
#post_content{width:520px;height:600px;background:#ECC85D;float:left;}
#right_sidebar{width:200px;height:600px;background:#800040;float:right;}
#footer{width:100%;height:80px;background:#81269F;}