I recently updated my gVim to version 8 compiled with gtk 3, and I found there are strange inner borders around the gVim window:
This picture may not very clear but if you look carefully you can see the white borders on the right side and the bottom. I have solved this issue by setting a dark color to the border on gtk 2, but on gtk3 it happends again. Any idea of removing this border completely on gtk 3?
Gtk3 uses css to style applications. To remove the white border from the gVim window, edit the file ~/.config/gtk-3.0/gtk.css
and enter the following:
@define-color YOUR_BACKGROUND_COLOR #rrggbb;
window#vim-main-window {
background-color: @YOUR_BACKGROUND_COLOR;
}