Description of issue:
When hovering over the pin/unpin area of a navigation bar item, a pin or unpin tooltip appears, but there is no visible button. If I click, the appropriate pin or unpin action does occur. So, this is only a minor cosmetic issue. Using Edge.
I expected:
A visible button when hovering over the pin/unpin area.
What actually happened:

(Sorry about the somewhat truncated image. It took several tries to get one even this good.)
