@charset "utf-8";
/* CSS Document */
html, body{
height:100%;
}

#image
{
position:absolute;
left: 50%;
width: 1000px;
margin-left: -500px; /* negative Hälfte von width:400px */
top: 50%;
height: 600px;
margin-top: -300px; /* negative Hälfte von height:150px */
}