Center text on page (remove invisible widgets?)

On the referenced page I want the text to more or less be centered on the page, like it is on the home page, https://www.lansi.tech. Seems like this should be simple, but I can’t find the setting. I have removed the sidebar widget, but could there be an invisible one?

Please note, I’m not talking about paragraph centering.

• This topic was modified 5 years, 7 months ago by sec55.

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