help with Writr theme please!

I have dabbled with it, but I need someone far more experienced than I am to tell me how to center everything on the page in the Writr theme. What I mean is, I need the columns to be centered within the web page (they can stay the same size as they are now, I just need them moved to center).

I’m located at icase.org/wp. I haven’t done much yet because I don’t want to invest too much time into it if things can’t be centered.

Thanks in advance for any and all help!

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