div.content_wrap {width: 600px;height:380px;}
div.content_wrap div.left{float: left;width: 250px;}
div.content_wrap div.right{float: right;width: 340px;}
div.zTreeDemoBackground {width:250px;height:362px;text-align:left;}

ul.ztree {margin-top: 10px;width:220px;height:360px;overflow-y:scroll;overflow-x:auto;}

ul.menu {border: 1px solid #617775;background: #f0f6e4;}