Empty Space in Simple page in Berlin

I am using the Berlin theme and want an image and text side by side in my home page (a simple page).

However, the Berlin simple page by default seems to leave half the page blank and has the text and image on the same side. I've messed about with the style sheet and nothing has worked.

Any suggestions?

Can you share a link to the page in question? No ideas offhand, but I might be able to help if I can see the page with the issue.