[FEATURE] Color options besides brownish-gray

[Minoqi]

Is your feature request related to a problem? Please describe.
The default brownish-gray color looks fine against the light theme, but can look ugly in other themes like the dark theme.

Describe the solution you'd like
A way to set a color besides the default brownish-gray. Maybe in the settings of the plugin to make it universal?

[browneyedsoul]

I plan to implement a customization feature in the future. However, it won't be available soon, so you might have to use custom CSS until then