Images in activity stream

Hello!
When a user posts an image in the activity stream and I click on it, it looks terrible: dull window, no close button, all content behind it dissapears. see the attached screenshot.
How do I change it so it shows a window, only the size of the picture? and how do i limit the size of the picture?
Thank you,
Andrei

That typically happens due to the viewport metadata being set incorrectly in your Joomla template. Try our demo site below to see what it's supposed to look like.

demo.cbdemosites.com/

Switch to default Joomla protostar template, clear Joomla cache, then retry to see if it's a viewport issue. If issue still present then it's a CSS conflict from somewhere.

i tried it and still no change. How do i find the css conflict?

Are you using any CSS overrides in CB? If so try removing your CSS overrides. Typically though this is entirely a viewport issue so it's surprising switching to protostar template and clearing cache didn't resolve the issue.