Currently, many of them are too dark.
<rdar://problem/65563148>
This is tricky because Big Sur glyphs (in Finder toolbar and sidebar, for instance) have wider outlines than Web Inspector's. Also, Big Sur glyphs have simpler shapes, in general. I'm experimenting with what I can do without redoing the glyphs.
I'll update the colors where needed as a part of Bug 214366 - Web Inspector: on Big Sur, match OS background, text, and border colors. *** This bug has been marked as a duplicate of bug 214366 ***