html,body{width:100%;height:100%;margin:0}body{font-family:sans-serif;background-color:#000;background-image:-webkit-gradient(linear, left top, left bottom, color-stop(20%, #000000), color-stop(80%, #5a5a5a));background-image:linear-gradient(180deg, #000000 20%, #5a5a5a 80%)}#debugButton{position:absolute}