#mobileheaderimg { background: url(/UserFiles/Image/Header/pagina-niet-gevonden.jpg) top center no-repeat; background-size: cover;  }

@media screen and (min-width: 48em) {
    body { background:url(/UserFiles/Image/Header/pagina-niet-gevonden.jpg) top right no-repeat; background-size: contain; }
}
@media screen and (min-width: 64em) {
    body { background:url(/UserFiles/Image/Header/pagina-niet-gevonden.jpg) top right 5em no-repeat; background-size: contain; }
}