Center align content

Hello everyone,
I’ve just started setting up a website, but I cannot manage to have the content of each page centered.

I’ll try to explain myself, if I view any page of the website from my laptop, the content is always aligned to the left, unless I start shrinking the window horizontally, then after a certain point it will be viewed centered.
If I look at the pages through my phone, since the screen is small, they will appear centered.

I would like my content to always be centered no matter how big the screen is.

The theme I am using is Maicha Blog, and as you can see from their demo page: https://demo.nomadicguy.com/maicha-blog/, that’s EXACTLY the effect I would like to obtain, everything is centered.

I hope I was clear enough.

Thanks so much!

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