Django Themes help

I'm working on a small program that will help me in my dive shop. Since I'm trying to learn to program in Python using Django, I wanted to create something to help me.  My issue is I cannot figure out how to center items on my page. For example (see screen shot) 

My code is located on Github:  https://github.com/wrnash1/ascubadiving

Any suggestions on how I can improve the site?

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