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This PR has PCUI define appropriate scrollbar styling.
Here are some comparisons of scrollbar styling across Chrome (Safari looks the same) and Firefox:
No styling:
CSS Scrollbars Styling Module Level 1:
WebKit Psuedo-Element styling:
Despite hover/selection color differences, the WebKit styling seems to look most similar to the Firefox scrollbars which use the standardized CSS properties. So this is what this PR implements.