:root{
	--nav-height: 5px;
	--center-width: 625px;
	--footer-height: 11px;
}
html,body,#center{height: 100%;}
body,#content{width: 100%;}
body{
	margin: 0;
	display: flex;
    justify-content: center;
}
#center{
	box-sizing: border-box;
    width: var(--center-width);
	display: flex;
    flex-direction: column;
	align-content: space-between;
    align-items: stretch;
}
#content{flex-grow: 1;}
#top{flex: 0 0 var(--nav-height);}
#bottom{
    flex: 0 0 var(--footer-height);
	text-align: center;
	padding: 7px 0;
}