<p><code>#GeanyMainWindow > box > paned > paned > notebook:last-child { border-right: 0; }</code><br>
in ~/.config/gtk-3.0/gtk.css works fine, thank you! Now if this just was the default (because I think many people would benefit from this). I agree it would be the best and the most systematic to fix this in GTK+, since this issue occurs in many apps.</p>

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