Getting better contrast colors for up/down vote buttons in darkly-compact theme?

I use the darkly-compoact theme in the web interface for lemmy, here on lemmy.world. How can I get the blue and red colors for up and down vote to be higher contrast? As-is, the pastel blue is so close to the default grey that I end up thinking an upvote didn't register. I'd prefer not to have to install some browser script just for this, and that the theme just be more inclusive of people with vision issues such as color blindness or looking for higher contrast colors.