Additional vertical scroll bar shown when top banner enabled and Namespace filter opens

[richard-cox]

Setup

• Rancher version: 2.10.0

Describe the bug

• vertical scroll bar is usefully just for the page content area (see screenshot 1)
• when the banner is enabled and the namespace filter expanded an additional vertical scroll bar is shown (see screenshot 2)
  • the new vertical scroll bar means that a horizontal bar is also shown
• the vertical scroll bar is even added when the page is full height with plenty of space, and the page content area also gains one too

To Reproduce

• Global Settings --> Banners --> enable and set text of Header Banner --> Apply
• nav to a cluster --> expand namespace selector

Result

• see screenshot 2

Expected Result

• no new scroll bars when opening drop down

Screenshots
screenshot 1

screenshot 2