centering content on pages

I’m having trouble centering content on pages I’ve created. This page, the content is centered on the page but only because the text above the slider is more than one line:

https://216photographicarts.com/weddings-2/

The slider is not centered on this page:

https://216photographicarts.com/commission-2/

This page does not contain sliders, text only and is not centered:

https://216photographicarts.com/pricing/

The pages are set to full-width. All of the code in the text editor is identical for each page.

Thanks in advance.