How to change the color of the scrollbar and slider in Kubuntu 20.4 systemwide [ Solved ]

I want to change the colors of my scrollbar and slider systemwide. I already changed the width to my liking, but have no such luck with the colors.

Looked around on this forum and searched for widgets, but can't seem to find the solution. I played around in .config/gtk-3.0/colors.css and config/gtk-3.0/gtk.css, but that only changed things in gtk-3.0 applications (which is normal).

I want the changes to be systemwide though.

I use:

• OS: Kubuntu 20.04
• KDE Plasma-version: 5.18.5
• Version van KDE-Frameworks: 5.68.0
• Qt-version: 5.12.8
• Kernel-version: 5.11.0-38-generic
• Type OS: 64-bit
• Processors: 8 × Intel® Core™ i7-10510U CPU @ 1.80GHz
• Geheugen: 15,3 GiB RAM

in triple boot with Win10 (Yeah, I know) and Mint 20.1 Ulyssa Cinnamon on a laptop.

edit 221021-1534 I looked at a post from Julian Borrero, which is for 19.10, but can't get that to work. How could I change the scrollbars colors on Plasma(5.16) on Kubuntu 19.10?. My result was an error.log with 8 times

Compiling the Fortran compiler identification source file "CMakeFortranCompilerId.F" failed. Compiler: CMAKE_Fortran_COMPILER-NOTFOUND Build flags: Id flags: -v

The output was: No such file or directory.

This is all new to me. I have a qtcurve.zip ( from Github ) in my downloadsfolder. Where do I put this? Do I unpack it? I have cmake and cmake-3.16folders in user/share.

My /home is a seperate partition btw, although I think that this doesn't matter at the moment.

1 Answer

Since you stumbled upon qtcurve in the question you linked, you just need to know, that you don't need to compile it yourself, in 20.04 the package exists in the official repositories and can be easily installed with

sudo apt install qtcurve

After installation, go to System Settings>Appearance>Application Style, choose the new application style "QtCurve" and edit it's settings.

After making your changes, close the editor window with the OK-button and then Apply your changes in the System Settings window.

Note that this will affect only native KDE applications which are based on Qt. It will not affect applications based on GTK.