Could you help me to customize coursepress pro while using my own theme?

I don't really like the appearance of the coursepress pro on my theme and I am trying to customize it more while still using my own theme. Here is my courses page: http://helloweb.gr/marianna/courses/ to see how it looks. I want to design things like the courses page, the dashboard, the menu. Could you suggest me a CSS style to apply?

Thanks a lot!