html,
body {
	background-color: #ffffff;
	font-family: 'Courier New', Courier, monospace;
	height: 100%;
	min-height: 100%;
}
body {
	display: flex;
	flex-direction: column;
	justify-content: space-between;
}
main {
	flex-grow: 21;
}
button,
footer,
header {
	background-color: #0080ff;
	color: #ffffff;
}
button {
	border: none;
	border-radius: 0.33em;
	font-weight: bolder;
}
header h1 {
	display: inline-block;
}