html, body {
	padding: 0;
	margin: 0;
	font-family: 'Roboto', sans-serif;
	overflow: hidden;
	-webkit-touch-callout: none;
	-webkit-user-select: none;
	-khtml-user-select: none;
	-moz-user-select: none;
	-ms-user-select: none;
	user-select: none;

	background: linear-gradient(
			#000 60%,#333 100%);
	background-size: 100vw 100vh;
}

#background {
	position: absolute;
	box-sizing: border-box;
	width: 1000rem;
	height: 1000rem;
	top: 50%;
	left: 50%;
	margin: -500rem 0 0 -500rem;
/*	background-image: url("img/ground.jpg"); */
	background-repeat: repeat;
	background-size: 300rem;
}

#scene {
	position: absolute;
	top: 0;
	left: 0;
	right: 0;
	bottom: 0;
/*	background-image:     linear-gradient(45deg, rgba(0,0,0,0.2) 25%,
		transparent 25%,transparent 75%,
		rgba(0,0,0,0.2) 75%, rgba(0,0,0,0.2) 100%),
	linear-gradient(45deg, rgba(0,0,0,0.2) 25%, transparent 25%,
		transparent 75%,
		rgba(0,0,0,0.2) 75%, rgba(0,0,0,0.2) 100%);
	background-size: 200px 200px;
	background-position: 0 0, 100px 100px;
*/
	background-color: rgba(0,0,0,0.5);

}

#c {
	position: absolute;
	box-sizing: border-box;
	width: 1000rem;
	height: 1000rem;
	top: 50%;
	left: 50%;
	margin: -500rem 0 0 -500rem;
}

#welcome {
	position: absolute;
	top: 0;
	left: 0;
	right: 0;
	bottom: 0;
	font-size: 10vmin;
	background: #8b9;
}

#welcome p {
	padding: 2vmin;
	font-size: 5vmin;
}

#levelup {
	position: absolute;
	top: 0;
	left: 0;
	right: 0;
	bottom: 0;
	font-size: 10vmin;
	background: #db9;
}

#gameover {
	position: absolute;
	top: 0;
	left: 0;
	right: 0;
	bottom: 0;
	font-size: 10vmin;
	background: #88d;
}

#hud {
	position: absolute;
	bottom: 0;
	left: 0;
	width: 100vmin;
	height: 7vmin;
	padding-left: 5vmin;
	font-size: 5vmin;
	color: #ff8;
	pointer-events: none;
}

.btn {
	display: inline-block;
	border-radius: 1vw;
	background: #ddd;
	cursor: pointer;
	padding: 0 2vw 0 2vw;
}

#watermark {
	font-size: 1.5vmin;
	color: #555;
}

#leftbtn {
	position: absolute;
	left: 0;
	top: 80vmin;
	width: 10vmin;
	height: 10vmin;
	background-color: red;
}

#nullspace {
	overflow: hidden;
	width: 1px;
	height: 1px;
}