How to center images on defaulted sidebar pages?

try:

.page-id-20.content-sidebar .content, .page-id-23.content-sidebar .content { float: none; width: 100%; }

not tested for any responsive behaviour.

Do I paste thaat code in Style.css?

ideally, use a ‘custom CSS’ plugin to paste the code (unless your theme has a custom CSS section?)

Thanks Michael!!! On my invest page, it is much better but not completely centered. DO you know how I can center that?

https://pasifloraphotography.com/invest/

on that page, the article container is centered (that is what the suggested code does).

the images arrangement seems to be formatted via some ‘aqua page builder’ plugin styles.
possibly ask in that plugin’s forum.

There is no padding code I can use? I build this page in the Page Builder section of Appearances.