Why are Chrome/Brave Browser Bookmark folders grey in Linux distros? Instead of yellow

Bookmark folders in Brave in Ubuntu mate are grey instead of yellow like they are in Windows. My bookmark folders are grey also in Google Chrome and when running in Manjaro-KDE. I think this has something to do with a switch in chromium browsers a few years ago to a "Materials Design". Also has been [discussed here](https://ubuntu-mate.community/t/chromium-bookmark-folder-icons/3058) . This [reddit post](https://www.reddit.com/r/techsupport/comments/4xgyqz/my_google_chrome_bookmark_folders_have_changed/) talks about the same problem but the suggested fix no longer works. Is it possible to style the bookmark folders back to yellow like you can with a Firefox userchrome.css? Anyone know why they "look right" (i.e: yellow) in Windows 10 but grey in Linux OS? Cheers, Flex