html, body, form
{
    height: 100%; 
}

body 
{
    width: auto;
    background-color: #000;
    /*background-image: url(http://cache.lego.com/upload/contentTemplating/UniverseDictionary/images/2057/pic1E5303044D6F906E8A83E500DDE2AADD.jpg);*/
    background-position: 50% 0px;
    background-repeat: no-repeat;
   
}