Make breadcrumbs more visible

anyone knows how to make the breadcrumbs more visible? I’m very happy with this customized theme but this is very hard to see for me. I have no background in CS but I have gone into the custom css file to mess around, changing the opacity without success.

If you know which section of the css code I should look into please help me. When I move the cursor at them they light up. If I can even disable that so that the they’re fully visible that’d be great.

Or if you know how to turn off the opacity in the default theme I’ll probably can figure out how to do it on my customized theme.

Thanks a lot for your help!