Align all text in about section

[teemania]

*Edit*
This is a desktop only issue

Hello, I'd like to align the text in my about section, including the 'About Tee Mania' heading. I've tried using 

h2, p {
text-align: center;
}

but the container is being really weird and not moving to the actual center. 

My website: https://teemania.co

[teemania]

I want it to be in the centred in the middle of the page