problem dispaly on mobile

hi,
I would like to see only one post insted of two on mobile when I use mosaic tile display on any page.
do you guys have any idea for a code that I can insert on my website.
I want it to influence all pages and posts.

thanks a lot.

• This topic was modified 7 years, 4 months ago by 30pips.

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