svg {
	display: block;
	margin: 3rem auto;
	outline: 1px solid #ddd;
}

svg .normal {
	stroke: #000;
	stroke-width: 2px;
	fill: #fff;
	cursor: pointer;
}

svg .normal:hover {
	stroke: #777;
	fill: #ccc;
}

svg .normal.active {
	stroke: #777;
	fill: red;
}

svg .connection {
	stroke: #000;
	stroke-width: 2px;
}