Image Widget position at top of sidebar

Hi,

I’m quite new in the WordPress-World. I’m setting up a WordPress-Site:
http://apotheke-sauter.de/leistungen
(Child Theme of Twenty Eleven)

Now I have problems with the image widget. I cannot have the images I inserted with the Image widget at the top of the sidebar. They always appear at the bottom of the sidebar.

I made quite a few changes in my child theme in the css and other files. Maybe I am blocking the upper space with something I wrote… Maybe by deleting the search field…?

I am looking through the forum for hours, tried almost everything, but nothing worked.

Thank you for your help in advance!!

Anna