body{ margin:0;font-family:微软雅黑;} .left{ width:200px; height:100%;font-size:18px; text-align:center;} .div1{text-align:center; width:200px; padding-top:10px;} .div1 a{text-decoration: none;color: black;} .div2{height:40px; line-height:40px;cursor: pointer; font-size:16px; position:relative;border:#ccc 1px dotted;width: 200px;} .div2:hover{background-image: url(../../images/ul_back.jpg);} .div3{display: none;cursor:pointer; font-size:13px;} .div3 ul{margin:0;padding:0;} .div3 li:hover{background-image: url(../../images/ul_back.jpg);} .div3 li{ height:30px; line-height:30px; list-style:none; border-bottom:#ccc 1px dotted; text-align:center;} body{ overflow-x:hidden;}