[BUG] Heading bar loading icon color & position

[mrjackwills]

Describe the bug
The loading icon in the heading bar is black on purple, and can be hard to read.
Loading icon shifting heading titles, shouldn't effect the heading positions

To Reproduce
Restart any container to see loading icon, and they headings shift

Expected behavior
Icon should be more visible and obvious, and shouldn't shift the heading titles

Additional context
Change the span to white