How do I customize my Toolbar?

So I’ve been trying to make my own custom theme for blender 2.8. But there’s one type of effect that I want to create that I simply don’t know how to do it. Which is how to make my toolbar looks like this:

If anyone knows how and what setting I should change, please let me know.

You mean the transparency right? You can tweak that in Preferences > Themes > 3d Viewport > Theme Space (at the bottom) > Region Background

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Ahh, thanks. I really appreciate it.

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