* {
margin: 0; 
padding: 0;
}


#wrapper {
position: absolute;
top: 50%;
left: 50%;
width: 640px;
height: 520px;
margin-top: -260px;
margin-left: -320px;
border: 0px solid white;
}


#container {
position: absolute;
top: 50%;
left: 50%;
width: 640px;
height: 480px;
margin-top: -240px;
margin-left: -320px;
border: 0px solid white;
}

#unten {
position: absolute;
left: 50%;
width: 640px;
margin-left: -320px;
border: 0px solid white;
margin-top: 550px;
}