How can I hide the "bottom-pocket" of Sidebery and have my tabs extend all the way to the bottom?

[Skyyblaze]

I'm using Firefox ESR 140 with the Vertical Tabs Sidebery integration by Macleod: https://codeberg.org/macleod/FirefoxSidebar

and I got everything setup mostly to how I want but when the amount of tabs exceed the window height Sidebery doesn't extend all the way to the bottom but rather scrolls into a weird "pocket" with a dropshadow as you can see here:

Is there any way I can disable/hide the bottom box so Sidebery extends fully to the bottom? From my own poking around it might be related to box#sidebar main but trying to hide that element did nothing so I'm at a loss.

Thanks for help in advance!

[Skyyblaze]

I fixed it, the offending code was in the initial Sidebar modification in sidebar.css!

#sidebar-box #sidebar {
  padding-bottom: 50px;
  border: medium !important;
  border: none !important;
  border-radius: 0 !important;
  box-shadow: none !important;
}

I only kept the border-radius value to prevent the separator from arching but removing the rest removed the weird pocket at the bottom.