So control panel design was updated.
But there’s a visual quirk happening.
If you go to Settings and press “Active Sessions” to see all of your active sessions, the whole website’s background becomes brighter(?)
Before clicking “Active Sessions”
After clicking “Active Sessions”
At first, I hadn’t realized it until I clicked on “Active Sessions” again to close it, then I realized the page suddenly darkened a bit, only to realize it happens back and forth when closing and opening the “Active Sessions” tab.