style.css

body {
	display: grid;

	grid-template-rows: 50px 1fr;
	grid-template-columns: 180px 1fr 1fr;
	grid-template-areas:
		"n v t"
		"n v e";

	height: 100vh;
	margin: 0;
	overflow: hidden;
}
.horizontal {
	grid-template-rows: repeat(2, 1fr);
	grid-template-columns: 180px 50px 1fr;
	grid-template-areas:
		"n v v"
		"n t e";
}
#sidebar {
	grid-area: n;
	overflow-x: hidden;
	overflow-y: auto;
	display: flex;
	flex-direction: column;
	justify-content: space-between;

	font-family: sans-serif;//TODO;
	color: white;
	background: black;
	line-height: 25px;
}
iframe {
	grid-area: v;

	width: 100%;
	height: 100%;

	background: #222222;
	border: none;
}
#editor {
	grid-area: e;

	background: #1e1e1e;
	// important for resizing;
	overflow: hidden;
}
#errorContainer {
	pointer-events: none;
	grid-area: v;
	z-index: 1;

	margin-left: 25px;
	margin-right: 25px;
}
#errorContainer div {
	pointer-events:auto;
	margin-top: 5px;
	padding: 4px;
	padding-left: 10px;
	padding-right: 10px;

	color: white;
	background: maroon;
	border-radius: 2px;
	box-shadow: 2px 2px 3px black;

	font-family: Consolas,Lucida Console,Menlo,Monaco,monospace;
}

@keyframes rotate {
	from {transform: rotate(0deg);}
	to {transform: rotate(90deg);}
}
h3 {
	cursor: pointer;
	margin-top: 15px;
	margin-bottom: 2px;
}
h3:before {
	display: inline-block;
	width: 20px;
	height: 20px;
	text-align: center;
	line-height: 18px;//TODO this value;
	content: "\203A";
}
.open:before {
	transform: rotate(90deg);
	animation-name: rotate;
	animation-duration: 0.4s;
}
ul {
	display: none;
	list-style-type: none;
	padding-left: 20px;
	margin: 0px;
}
.open+ul {
	display: block;
}
nav ul a {
	color: #444444;
	text-decoration: none;
}
nav ul a[href] {
	color: #EEEEEE;
}
#github {
	margin-top: 15px;
	text-align: center;
}

#toolbar {
	grid-area: t;
	background: black;
}
svg {
	cursor: pointer;
}