Gridsby Center Content

Hi everyone,

I have a question regarding my content area. I want my content on the About me, blog etc. to be outlined in the middle of my website with even parts of white on the sides in stead of the content beging glued to the left. I already disabled all the widgets in the sidebar area but this does not solve my probleem, the white right part is still bigger. Does anyone know you I can make my content look centered?

Thank you so much in advance,

Natasja

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