When you have your browser set to zoom out to 90% or lower you will get a large margin on the viewtopic page between every posts.
This is caused by the CSS calculation in /styles/prosilver/theme/responsive.css:
The "border width" is set to 1px, but this is not correct when zoomed out.
Steps to reproduce:
- Visit https://area51.phpbb.com/phpBB/viewtopic.php?f=81&t=75446
- Zoom out in browser