Hey alchymyth,
first of all, thanks for checking out my post.
i tried both things (removing the height and/or using min-height). But nothing really changes. See https://www.mintonline.be/anits/?page_id=65 after the css update.
Really strange. I’ve been looking at lots of different options with Firebug, but i can’t seem to find the problem. Grr. Frustrating, because i can see the fields with Firebug.