Make branch icon stand out more (#20726) (#20774)

Make branch icon stand out more (#20726) (#20774)

- Backport #20726
  - Currently the branch icon is "squashed" between the two branch names and feels a bit "amateur-ish" to my feeling(relative to other UI elements).
  - This patch tries to improve that by making the icon bigger and by adding some margin to not have a "squashed" icon.
  - This patch also includes a "fix", for some reason this symbol is not centering correctly. So apply allign-items: center to the top div