Looks like you got this resolved. It’s always appreciated if you share your solution as it will likely help others with the same question in the future. 🙂
For anyone else who may come across this thread, the necessary CSS is here:
https://ww.wp.xz.cn/support/topic/how-to-change-the-menu-dots-color?replies=7#post-7453894
I just wanted to give you a heads-up that if you edited the theme files directly, your changes will be overwritten every time the theme is updated to the latest version. For that reason, it’s recommended that you never touch the original theme files.
Instead, an easy way to add custom CSS is to install the Jetpack plugin and activate the Custom CSS module. You’ll then add your custom CSS in the new stylesheet editor that’ll appear in your dashboard, under Appearance > Edit CSS.
As alternatives, you could either install a standalone custom CSS plugin, or create a child theme.