body{
padding:0;margin:0;overflow: hidden;

}
canvas{
	background:url(../img/bg.jpg) repeat-x;
}
.startBtn{
	width:12%;height:50px;position:absolute;
	left:40%;top:48%;color:#000;font-weight:bold;
	text-align: center;cursor:pointer;
	border:10px solid #ccc;line-height:50px;
	border-radius: 30px;
}