Is there a way to make the icons in Geany IDE brighter?

I'm using the Geany IDE with the GTK3 theme set to Adwaita-Dark. For the most part this works perfectly fine. However, the icons at the top screen are too dark to see clearly: Is it possible to change these icons to make them more visible against the dark background? Thanks for any help!

Solution

I fixed it. If anyone else is in a similar situation I used the Xfce appearance settings (I'm using Manjaro Linux). In retrospect it was a little illogical to be searching for solutions using the GTK settings when I have an Xfce desktop, but now I know.