Is it possible to make the scrollbars wider in 15.10?

Solution 1:

Instead of customizing a theme, set the general properties of gtk-3.0. I wrote out how to do it earlier this week on this one.

How to get a bigger static scrollbar (aka normal scrollbar)?

Mine is the answer that has no up votes :( Here's the gist

$ cat .config/gtk-3.0/gtk.css
.scrollbar {
  -GtkScrollbar-has-backward-stepper: true;
  -GtkScrollbar-has-forward-stepper: true;
  -GtkRange-slider-width: 20;
  -GtkRange-stepper-size: 20;
}

Solution 2:

If you mean the thin GTK3 scrollbar, it is from the theme properties. This is for Ambiance.

1. Open /usr/share/themes/Ambiance/gtk-3.0/gtk-widgets.css for editing

   gksu gedit
   

2. Go around line 1143 and change:

       -GtkRange-slider-width: 10;
   

   to

       -GtkRange-slider-width: 20;
   

BTW, you can always take a adventure with try & fail :)

grep -rn scroll /usr/share/themes/Ambiance/