Unnecessary border

Whenever I open a window, the focused window is getting a distracting border. I am not getting the reason behind it. I also checked by changing the application theme, restarting the system, and updating but nothing seems to solve the issue. I am attaching screenshots. When I go to full-screen mode hiding the panel, the border is still as if the panel is present but the window is going to full-screen mode, hence a pretty distracting experience is going on.

Do help me with this problem.

Check if you have some unnecessary border related setting in ~/.config/gtk-3.0/gtk.css.

Edit - I am able to replicate this. See screenshot.


Disable all extensions, logoff and see if it’s still reproducible. If not, re-enable each one and see which is causing it.