Title color changes with os dark mode and cannot be fixed

[s5409693]

Hello,

Gooey is a great help for me to deploy code to non-programmers, but some people have their OS in dark mode. Gooey picks up the dark mode in some widgets, but not in all, so I would like to prescribe the font and background color of every part of a Gooey application, but the program title and program description cannot be changed.

• OS: Debian 11
• Python version: 3.8.8
• Gooey version: 1.0.8.1
• Problem description: I have noticed that when my OS (Debian 11) is in dark mode, some of the widgets adopt the dark theme and some don't, making the application look very strange. So I tried to prescribe the font and background color of all widgets, which worked fine. For the program title and description, however, I have found no way to alter the font color. If it is possible and I just have not found the way how to do it, it would be nice to add this to the documentation. Please find some example code below
• Expected behavior: Either (a) the program title color can be prescribed or (b) if this is not possible, at least the program title does not change depending on the user's OS settings.
• Actual behavior: I have not found a way to prescribe the color and when I change gnome-tweaks -- appearance -- themes -- applications from Adwaita to Adwaita-dark, the title color changes from black to white.
• Code example:

import gooey

@gooey.Gooey(
        header_color = '#ff0000',       # tried, but has no effect
        header_font_color = '#ff0000',  # tried, but has no effect
        header_bg_color = '#0000ff',    # this works fine
        )
def main():
    parser = gooey.GooeyParser(description='Some test parser')
    parser.add_argument('input_filename', type=str, widget='FileChooser')
    args = parser.parse_args()

if __name__ == "__main__":
    main()

• Appearance with Adwaita
  
• Appearance with Adwaita-dark
  

Thank you and best regards
Paul Seibert