.themen-header .image-header { background-image: url('/fileadmin/user_upload/nistgelegenheiten.jpg'); }

@media only screen and (max-width: 1024px) {.themen-header .image-header { background-image: url('/fileadmin/user_upload/nistgelegenheiten.jpg'); }}

@media only screen and (max-width: 480px) {.themen-header .image-header { background-image: url('/fileadmin/user_upload/nistgelegenheiten.jpg'); }}