This theme is currently made for dark mode, light mode is not yet customized.
Wasp is available in Obsidian Community Themes.
In Obsidian go to Settings > Appearance > Community Themes > Browse
Search for: Wasp by Santi Younger
Click “Use”
If you get a window click “Overwrite”
Done, enjoy!
PS: If you are reading this from Obsidian, ignore the "Installation" instructions since you already know how to do it. It's probably too late now if you've already read this 👆 😂