There is a white border and the images are not displayed in full size?
For example, the code in the post for an image is:
<div class="animatebox animate rollIn"><img src="/images/presse/Nov_2009_2.jpg" alt="" /></div>
(In J3 this worked)
J4 link error: http://dksj4test.hausverwaltung-nitzsche.de/index.php/wir-ueber-uns/presseartikel
J3 Link OK: https://www.dks-ev.de/index.php/wir-ueber-uns/presseartikel