table, td {
	border: 1px solid black;
	border-collapse: collapse;
}
td {
	width: 1.5em;
	height: 1.5em;
}
input[type=number] {
	width: 3em;
}

body {
	font-size: 1em;
}

.unvisited {}
.open {
	background-color: orange;
}
.closed {
	background-color: red;
}
.source {
	background-color: green;
}
.target {
	background-color: brown;
}
.obstacle {
	background-color: black;
}
.path {
	background-color: yellow;
}