Centring text and content on portfolio pages

Hi,

I’m not sure why, but all my text/content on my portfolio pages (within the portfolio) is aligned to the left, I cannot get them centred. I want the content in the middle. I’ve been through all my settings, and disabled my plugins one by one, but nothing has made a difference. I would really appreciate any advice you can offer

Example pages:
https://jennymcnamara.com/portfolio/proposal-for-seaton-delaval-hall-emerging-artists-prize-shortlist/
https://jennymcnamara.com/portfolio/tunnel-vision/
https://jennymcnamara.com/portfolio/mfa-degree-show-2/

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