Add scrollbar to content

I am working on a wp site, the first page is ok, but on the second page (visie) my content is too long. So it has been placed trough my background. Can anyone tell me how i can solve this with a scrollbar?
Thanks!

Marjolein

This is the adress:

http://www.mrs-jones.nl/clients/pinkeltje/

And below my .css

[CSS moderated – a link to your site is enough to access the styles]