I have the problem with background picture in box-layout.

If have have no box-layout then all section are transparent and I can see in the background my picture. You can see it via this link: http://vorbereitung.tsv-malsch.de/

But if I activate the box-layout then the the box background is no longer transparent, in this case white. This you can sse in the following link: http://vorbereitung.tsv-malsch.de/index.php/eroeffnungsseite-mitgliederbereich/test-new-home

So waht have I do to that the box becomes transparent?