I hate the overlay scrollbars as I find I have to hunt for them, so they are disabled. To over come the missing items that used to come with fallback/flashback Gnome desktop I use 2 sections of code to bring back functionality.
'gtk-widgets.css'
usually in the Theme section of the current theme
`/*************

• scrollbar *
  *************/
  .scrollbar,
  .scrollbar.vertical {
  -GtkScrollbar-has-backward-stepper: 1;
  -GtkScrollbar-has-forward-stepper: 1;
  -GtkRange-slider-width: 16;
  -GtkRange-stepper-size: 16;
  -GtkRange-stepper-spacing: 0;
  -GtkRange-trough-border: 0;
  -GtkScrollbar-min-slider-length: 30;

  border-radius: 20px;

  border-image: none;
  }

.scrollbar.trough,
.scrollbar.trough.vertical {
border-color: shade (@bg_color, 0.8);
}

.scrollbar.slider,
.scrollbar.slider:hover,
.scrollbar.button,
.scrollbar.slider.vertical,
.scrollbar.slider.vertical:hover,
.scrollbar.button.vertical {
border-width: 1px;
border-style: solid;
border-color: shade (@bg_color, 0.86);
background-image: -gtk-gradient (linear, left top, right top,
from (shade (#BDE3F0, 1.08)),
color-stop (0.5, #BDE3F0),
to (shade (#BDE3F0, 0.94)));
box-shadow: inset 1px 0 shade (@bg_color, 1.1),
inset -1px 0 shade (@bg_color, 1.01),
inset 0 1px shade (@bg_color, 1.1),
inset 0 -1px shade (@bg_color, 1.1);
}

.scrollbar.slider.horizontal,
.scrollbar.slider.horizontal:hover,
.scrollbar.button.horizontal {
background-image: -gtk-gradient (linear, left top, left bottom,
from (shade (#BDE3F0, 1.08)),
color-stop (0.5, #BDE3F0),
to (shade (#BDE3F0, 0.94)));
box-shadow: inset 1px 0 shade (@bg_color, 1.1),
inset -1px 0 shade (@bg_color, 1.1),
inset 0 1px shade (@bg_color, 1.1),
inset 0 -1px shade (@bg_color, 1.01);
}

/* overlay scrollbar */
OsThumb {
color: shade (@fg_color, 1.6);
}`

and 'gtk.css'
in the .config/gtk-3.0 section and /gtk-2.0 section
`/**************

• Scrollbars * **************/ .scrollbar { -GtkScrollbar-has-backward-stepper: 1; -GtkScrollbar-has-forward-stepper: 1; -GtkRange-slider-width: 16; -GtkRange-stepper-size: 16; -GtkRange-stepper-spacing: 0; -GtkRange-trough-border: 0; -GtkScrollbar-min-slider-length: 30; }`

Perhaps I do not know where to put these for Geany?
Thanks James Niland

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