Files app: scroll bar in Chromium is very thin

[archont00]

Steps to reproduce

1. Login to NC via Chromium web browser.
2. Open Files app / folder with items list longer than the screen height
3. Try to scroll down using mouse.

Expected behaviour

On mouse hover, show a wider scroll bar.

Actual behaviour

It is difficult to point the mouse cursor to the scroll bar thin just 4 pixels, especially on high dpi screen (it actually is wide just about 1.2 mm or so).

Server configuration

Nextcloud version: (see Nextcloud admin page)
12.0.1

Updated from an older Nextcloud/ownCloud or fresh install:
From 12.0

Where did you install Nextcloud from:
wonderfall/nextcloud docker image

[MorrisJobke]

cc @nextcloud/designers

[jancborchardt]

Seems like a good starter issue to experiment with increasing the scrollbar width (a bit) on hover.