Pan sliders

On the right hand side and bottom of the page, there is a 'slider' for panning left/right and up/down. Is there any way of changing the colour of those so that the can be seen/found more easily. And, yes, I know  that you can change 'pan' to be controlled by the mouse, but I prefer to use that for zoom in/out.

You should be able to do that locally with a browser extension like Stylus.

You have some options in Firefox (no extension required). Goto about:config   - accept the risk and continue Paste this into the config search box  widget.non-native-theme.scrollbar.style Delete the current 0 value for the default OS style scrollbar. Then input the value 1 (Mac OS X), 2 (GTX), 3 (Android), 4 (Windows 10), or 5 (Windows 11) in the widget.non-native-theme.scrollbar.style box for the scrollbar style you want to change to. For example, enter 4 to change the scrollbar to the default Windows 10 design I sort of like the 1 (Mac OS X) option, it gives a scrollbar centred on the horizontal and vertical edges