* {
	margin: 0;
	padding: 0;
	box-sizing: border-box;
}
body {
	background: #111;
	display: flex;
	align-items: center;
	justify-content: center;
	height: 100vh;
}
#container {
	display: flex;
	align-items: center;
	justify-content: center;
	flex-wrap: wrap;
	max-width: 500px;
}
.square {
	background: #1d1d1d;
	box-shadow: 0 0 2px #000;
	margin: 2px;
	width: 16px;
	height: 16px;
	transition: all 2s;
}
.square:hover {
	transition-duration: 0s;
}