An extension just for making scrollbars of chrome simple and black. It's better to combine this with chrome theme "Simple Black" and if possible, please try it, too.
Simple Black
https://chrome.google.com/webstore/detail/eiebpogodlfaodmhajdmmkllklacjfgk/publish-accepted
谷歌浏览器、其他Chromium内核的浏览器
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