.header nav{display:none}.header,.content{text-align:center}.header{background:#4bb5ef;font-size:16px;font-weight:700;color:#fff;line-height:50px;-moz-box-sizing:border-box;box-sizing:border-box;width:100%;height:50px;padding:0 50px}.header.fixed{position:fixed;top:0;left:0}.header a{display:block;width:28px;height:18px;padding:11px;margin:5px;position:absolute;top:0;left:0}.header a:before,.header a:after{content:'';display:block;background:#fff;height:2px}.header a span{background:#fff;display:block;height:2px;margin:6px 0}