Social icons

I’m working in a local environment right now so I can only give you the url of a live page. The little social media module that you can see at the top left of the post content, it become completely dark when I activate the dark mode. Only the icons stays white, but all the colored squares becomes invisible on a dark background. I tried to change that with CSS but with no luck. Do you think there a way to keep the colored squares of those icons in dark mode? Thanks a lot. The page I need help with: [ log in to see the link]