.webgl-content {
	position:relative;
}

.webgl-content .fullscreen_btn {
	opacity: .4;
	position: absolute;
	bottom: 0;
	right: 0;
	margin: 5px;
	font-size: 16px;
	display: block;
	transition: opacity 0.4s;
	background: none;
	padding: 0;
	border: 0;
	cursor: pointer;
}

.webgl-content .fullscreen_btn:hover {
	opacity: .8;
}

.webgl-content .fullscreen_btn img {
	display: block;
	width: 20px;
	height: 20px;
}