article {
	background-color: #466;
	}
h1 {
	color: #344;
	font-size: 5.5vh;
	text-shadow: 0px 0px 0.6em #8AA, 0.02em 0.02em 0.15em #FFF;
	}
.sideblauw {
	top: 25vh;
	background-color: #66A;
}
.vakblauw {
	width: 400px;
	float: left;
	margin: 1em;
	padding: 1em;
	background-color: #337;
	border: solid 0.2em #AAC;
	color: #AAC;
}

#cont {
	position: absolute;
	top: 50%;
	left: 50%;
	transform: translate(-50%, -50%);
	display: block;
	font-size: 0.8em;
}
#graph {
	position: relative;
	float: left;
	clear: both;
	border: 1px solid #888;
	background-color: #CCC;
	z-index: 1;
	}
#sgraph {
	position: absolute;
	top: 0px;
	left: 0px;
	z-index: 2;
	}
#graph, #sgraph {
	width: 650px;
	height: 400px;
	}
#control {
	float: left;
	clear: both;
	margin-top: 10px;
	padding: 10px;
	background-color: #FFE;
	}
.slider_cont {
	float: left;
	clear: both;
	margin: 10px;
	border: 1px solid #888;
	}
.slider_label {
	float: left;
	margin: 9px;
	width: 100px;
	font-size: 1.3em;
	}
.slider_track {
	float: left;
	position: relative;
	margin: 15px;
	width: 250px;
	height: 3px;
	border: 1px solid #666;
	background-color: #000;
	}
.slider_knob {
	position: absolute;
	top: -4px;
	left: -4px;
	width: 12px;
	height: 12px;
	border: 1px solid #446;
	border-radius: 7px;
	background-color: #88C;
	cursor: pointer;
	}