I came here today in order to ask this exact question. It's pretty much the only issue I have with the Darkcula theme.
Mostly, the problem is (for me), being able to quickly identify the scroll bar slider so I can grab it. Visually, it doesn't stand out enough for me and it's kind of mentally jarring to have to "think" about it when I have so many other things I'm thinking about at the time.
I get that it's "fixed", but... please reconsider either changing it a bit or allowing us as end users to do so.
This color is defined in L&f and can't be customized. See https://youtrack.jetbrains.com/issue/IDEA-102320#comment=27-480274
Bummer
I came here today in order to ask this exact question. It's pretty much the only issue I have with the Darkcula theme.
Mostly, the problem is (for me), being able to quickly identify the scroll bar slider so I can grab it. Visually, it doesn't stand out enough for me and it's kind of mentally jarring to have to "think" about it when I have so many other things I'm thinking about at the time.
I get that it's "fixed", but... please reconsider either changing it a bit or allowing us as end users to do so.