House Contractor site

I’m working on a house contractor theme for wordpress. So far I’ve made this and I’m having trouble in making a menu for the site.

Here are the links for all of the subpages. - ‘about’ - ‘crude state/pre-build’ - ‘development state’ - ‘completed projects’

I was thinking of a menu like this:
Please bear with me, I’m not so good in CSS. Any ideas, suggestions?