:root {
	--background-color: #222222;
}

body {
	background-color: var(--background-color);
	color: #ffffff;
	font-family: Arial, sans-serif;
	height: fit-content;
	margin: 0;
	padding: 0;
}
div {
	width: 20px;
	height: 20px;
	background-color: #ff0000;
	margin: 20px;
}

div.container {
	width: 100px;
	height: 100px;
	background-color: #00ff00;
	overflow-y: auto;
	padding: 20px;
}

footer {
	position: absolute;
	bottom: 0;
	left: 0;
	right: 0;
}