index.css

html, section, img {
	background-color: rgba(0,0,0, 0.1);
}
body {
	text-align: center;
	margin: 0;
	padding: 0;
}
section {
	display: inline-block;
	/* margin: 0 auto; */
	margin: 1em;
	padding: 1em;
	text-align: left;
	vertical-align: top;
}
section div + div {
	margin-top: 1em;
}
a {
	color: #888;
}
a:hover {
	color: #000;
}
img {
	/* background-color: #000; */
}
img,
canvas {
	border: 1px solid #ddd;
	/* box-shadow: 3px 3px rgba(0,0,0, 0.1); */
}
canvas {
	position: relative;
}
canvas:hover {
	border-color: #aaa;
}
.toggle::after {
	content: ".";
}
.toggle::before {
	display: inline-block;
	border: 1px solid currentColor;
	margin-right: 4px;
	padding: 0;
	width: 23px;
	height: 23px;
	line-height: 23px;
	font-size: 22px;
	font-family: monospace;
	text-align: center;
	vertical-align: middle;
	content: "+";
}
.toggle.open::after {
	content: ":";
}
.toggle.open::before {
	content: "-";
}
.hid {
	display: none;
}