Padding in terminal

[aquila]

Create a file:

touch ~/.config/gtk-3.0/gtk.css

and add:

VteTerminal,
TerminalScreen,
vte-terminal {
    padding: 10px 10px 10px 10px;
    -VteTerminal-inner-border: 10px 10px 10px 10px;
}

[napcok]

If you prefer smaller left-side padding only: