html,
body {
	height: 100%;
}

.container {
	height: 100%;
  	min-height: 100%;
	display: flex;
	flex-direction: column;
}

.box {
	padding: 20px;
	display: flex;
	flex-direction: column;
	justify-content: center;
	align-items: center;
	flex: 1;
}