#wrapper {
  background: url(button/STARS_BK4.gif) no-repeat;
  height: 500px; 
  width: 630px; 
  position: relative;
  margin: -250px auto 0 auto;
  text-align: left;
}

body {
  background: #000;
  color: #ccc;
  padding-top: 25%;
  text-align: center;
  padding: 25% 0 0 0;
  margin: 0;
}

.imprint a {
	height: 50px;
	width: 50px;
	display: block;
	outline: none;
	background: url(Button/bu_im_ob.gif);
		float: left;
	margin-right: 15px;
	text-indent: -500em;
}

.imprint a:hover {
	height: 50px;
	width: 50px;
	display: block;
	outline: none;
	background: url(Button/bu_im_un.gif);
		float: left;
	margin-right: 15px;
	text-indent: -500em;
}