How can I change the scrollbar width in KDE Plasma 5.9.4 on Ubuntu 17.04?

The Application Style dialog box no longer contains this setting.

2 Answers 2


In KUbuntu 20.04 I found by changing some numbers in: /usr/share/themes/Breeze/gtk-3.0

Towards the end, in my case lines starting at line 38456, fixed my problem.

scrollbar trough {
    transition-duration: 0.1s;
    min-width: 20px;


scrollbar:hover trough {
    background-color: mix(@theme_unfocused_bg_color,@theme_unfocused_fg_color,0.7);
    min-width: 18px;
scrollbar:hover slider {
    min-width: 18px;

I don't know about 17.04, but in 18.04 you can select the Oxygen style, which has a setting for the scrollbar width. The default Breeze does not.

For gtk applications I created my own theme in ~/.themes based on an existing one in /usr/share/themes and modified gtk.css to make the scrollbar larger. This is easier with gtk-3.20 than with previous versions, you just have to increase some min-width in the Scrollbars section, and optionally the border-radius. In 3.18 and earlier you have to increase the stretch dimensions for many elements, in the same file.

Still, I wish developers would just use at least 20 pixels for a scrollbar by default, it's not too much out of 1920 pixels and these are well spent pixels...

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