Cake Art Template looks strange

Hello i activated the Cake Art template at http://www.sweetsformysweet.nl/, but it looks not the way it has too. What is or did I do wrong?

Hi

It looks like your main style.css is not proper. Just check it.

Thank you.

Thank you, but what is not proper, because i just uploaded the theme and changed nothing. I used this theme because i don’t know much about coding.