html, body {
  background-color: #000;
  width: 100%;
  height:100%;
  margin: 0;
  overflow: hidden;
}

#mb{
	width: 300px;
	height: 300px;
	position: absolute;
	top: 45%;
	left: 50%;
	margin-top: -150px;
	margin-left: -150px;
  background: url(../mb.gif);
  opacity: 1;
}

#impressum {
	position: absolute;
	right: 10px;
	bottom: 10px;
	color: #111;
	text-decoration: none;
	font-size: 10px;
}

#kontakt, #kontakt-hover {
	position: absolute;
	bottom: 10%;
	width: 200px;
	height: 40px;
	left: 50%;
	margin-left: -100px;
	background-image: url(../kontakt.png);
	background-size: contain;
}

#kontakt-hover {
	opacity: 0;
	background-image: url(../kontakt-hover.png);
	transition: opacity 2s;
}

#kontakt-hover:hover {
	opacity: 1;
}