I'm using Ubuntu 20.04 and Terminator 1.91. In Ubuntu 20.04, there are spaces between tabs and bordes of main window.

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Could you please advise if there is some way to remove these spaces?

I don't see such problem in Ubuntu 18.04.

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You can use GtkInspector to debug this kind of issue, and figure out which CSS style need be updated. You can find some reference here.

GTK_DEBUG=interactive terminator

And here's the fix:

mkdir -p ~/.config/gtk-3.0
vim ~/.config/gtk-3.0/gtk.css

.terminator-terminal-window notebook tabs {
    padding-left: 0;
    padding-right: 0;

.terminator-terminal-window notebook tab {
    margin-left: 0;
    margin-right: 0;

Those spaces should be gone, after restarting terminator.

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