Describe the solution you'd like

Hello,

Me, @aarohee-he, and @mishtigala19 have decided to make separate issues for our own themes rather than having all of them in one issue for better organization.

This is the theme I made, I call it "nautical blue." I attached screenshots and contrast tests of the theme in both light and dark mode.

Let me know what you think!

Type of feature

User Interface (UI)

Additional context

No response