Enlarged Buttons within Sub Windows

Hello! Is there a way to increase the size of the buttons and sliders (see red circles on attached photo) for the sub windows for editing color properties? (the attached photo shows the window when you select Colors > Levels)

I’ve already adjusted the font size on the gtkrc file for the dark theme to make the text viewable on my 3480 x 2160 monitor. Looking through the settings in the gtkrc, I can’t tell if I’m missing the line of code that adjusts that, or if I need to achieve this a different way.