div.zahl {
	float: left;
	width: 100px;
	height: 100px;
	border-style: solid;
	font-size: 2em;
	text-align: center;
	border-width: 1px;
}

.nichtprim {
	background-color: red;
}

.prim {
	background-color: green;
}

.aktuelles_testelement {
	background-color: blue;
}

.aktueller_testkandidat {
	background-color: yellow;
}

h1 {
	text-align: center;
}