Picture padding in mobile view

Hey!

First of all, thank you for creating such a beautiful and easily manageable theme! I’m in love with it!
There’s one problem I haven’t managed to figure out myself though. My site has a picture on top of the front page. While it looks good in computer view, in mobile view the padding of the layout seems to apply the same way as in desktop view, which in this case makes my picture really small and unreadable. I’ve tried a few CSS codes in the widget area and of course changed the padding in the mobile layout but none of this has made any effect.
Any recommendations?

The page I need help with: [log in to see the link]