Shortcut extension for Joomla

Sometimes you want to access a certain page in the admin section (for example: add articles, manage modules or to perform certain operations on extensions) but you have to do it through many steps. This module will help you work faster. Instead of going through multiple steps, you can get to the destination page with a click or a keyboard shortcut.
* This module is compatible with Joomla 3, 4, 5 and 6.
After installing the plugin, go to the Admin Page > System > Site Modules. Then, you select the Administration area.

Next, press the "New" button > JMP Shortcuts to get started. Add necessary shortcuts, Shortcuts can be a URL or a Javascript code snippet.

When you press a keyboard shortcut:
- With a URL, the website will redirect to this URL.
- With Javascript, the website will run this code.
Set the Position for the module to Bottom, the status to Published. Then, save the module.
After setup is complete, you will see this module in the bottom right corner of the screen. You can click it or press the key combination you set up to get started.

I have been googling how to change the menu colours, as the black text on my purple background is not very readable. However everything I have tried to change the text colour of the Off-Canvas main menu text to white did not work.
Would you know what custom CSS I would need to change all menu items to white text (including submenus).
Probably need background colour to not be white when hovering over submenus
Any help you can provide would be gratefully appreciated (or a pointer to some useful help).
Thank you
see
https://siteupdate.vedicmaths.org/index.php
InPre-Update Check for Joomla 5.4.4
for Off-Canvas it says
Joomla cannot detect the extension's compatibility with the target version of Joomla.
have you implemented the compatibility stuff for Joomla to upgrade extensions correctly ?
Have got two off canvas menus working (1. for tools and 2. for main menu)
However I can only get the Main menu to display the first level of menu items.
Have you any suggestions for getting the sub menu items to display ?
N.B. the menu item with sub menu items does display a down arrow, but trying to click on it only display the item at the main menu level.
see
https://siteupdate.vedicmaths.org/index.php
If you want to see where I have currently got to
What is wrong?
That imported page keeps on saying this, but nothing further is happening...