I just submit a fix for the original issue with the 3 polar alignment tools.

It is possible to set a dark theme for phd2 without any change in Ekos because phd2 use the Gtk theme and Ekos the Qt theme. Be careful to not use a theme setting software that change both.

Also be careful that since Ubuntu 20.04 wxWidgets is no more packaged for Gtk2 but only for Gtk3. The phd2 ppa version for 20.04 is build for Gtk3 so this is the Gtk3 theme you now need to change.

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