*{
 margin : 0;
 padding: 0;
 box-sizing: border-box;
}

html,
body {
	height: 100%;
	font-size: 13pt;
	font-weight: lighter; 
	font-family: helvetica;
	color: black;
}

div {
	position: relative;
	height: calc(100% / 12);
}

div:hover {
	background-color: black;
	color: white;
}

div span {
	display: block;
	position: absolute;
	top: 50%;
	left: 50%;
	transform: translate(-50%, -50%);
}

a:link {
        color: inherit;
        text-decoration: none;
      }

a:visited {
	color: black;
}