> On Jan 16, 2017, at 1:25 AM, Марко М. Костић <marko m kostic gmail com> wrote:
>
> GTK+3 Python3 programs with headerbars look out of place on macOS Sierra.
>
> I thought about using new GTK+ CSS system for styling them to look more like other
> native macOS programs.
>
> Is this a good idea?
> Anybody else did anything similar already?
What do you mean by "headerbars"?
Yes, it's been done. Google for "gtk3 themes mac".
Even if GtkHeaderBar hasn't been styled yet in one of those themes, it's likely that someone will since the CSS "API" has been declared stable in 3.20.
Regards,
Philip C