header { position:fixed; top:0px; left:0px; float:left; width:100%; background: #f8f8f8; border:none; border-bottom:1px solid #ccc; color:#fff; height:55px; } header span.logo img { width: 8rem; margin-top:.5rem; margin-left:.5rem; } header .menuButton { position: absolute; width: 30px; height: 50px; float: left; right: 10px; top: 0px; background: url(http://wap.yulinshufa.cn/yulinshufa.cn/images/ListMenu.png) no-repeat right center; background-size: 25px; overflow: hidden; line-height: 300px; } .head_menubox { display:none; position:fixed; right: 0px; top: 56px; width:100%; background:#f4bf09; border-radius:0px; z-index: 1; border-left:1px solid #ccc; } .head_menubox a { float:left; width:25%; line-height:350%; text-align:center; color: #fff; font-size:15px; border-bottom:1px solid #fff; }