#page-header-main { background-image: url(/fileadmin/_processed_/3/b/csm_Oel-1920px_3b4b3c6f04.jpg); }@media screen and (min-width: 640px) { #page-header-main { background-image: url(/fileadmin/_processed_/3/b/csm_Oel-1920px_9c3499383f.jpg); } }