Icon hide content not shows information when the mouse is on it

Steps to reproduce

1.listen a song

What happens?

No information appears for the hide icon like the icon heart means "add to favorites"

What is expected?

Show information of this icon

Context

Version 0.18.3+git.156d9c81 Funkwhale version(s) affected: x.y Version 0.18.3+git.156d9c81