Blog Designer Images not responsive

Hello,
I am using Blog Designer for my Wedding Blog, see link above.
In the bottom of each post page there is a section “further posts” where visitor can select other posts. That seems to be part of the Blog Designer layout.

Unfortunately the images of the “furher posts”-section are not at all responsive, neither in the desktop nor on mobile view. They always seem to be squeezed together, on mobile even more than desktop.

What must I do get these images responsive?

Looking forward to your response and support
Best regards
Birgit

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