[Bugfix:TAGrading] Improve late day banner visuals (#7633)
[Bugfix:TAGrading] Improve late day banner visuals (#7633)

* Update banners to be more accurate

* linting (:

* Requested changes
Submitty/Submitty,Submitty/Submitty,Submitty/Submitty,Submitty/Submitty,Submitty/Submitty,Submitty/Submitty,Submitty/Submitty,Submitty/Submitty,Submitty/Submitty