How do I modify the CSS if I used NPM install?

Thanks for this useful library.

I'm importing the CSS as 'import 'nprogress/nprogress.css'in a SvelteKit project. I could copy paste and edit the file but I thought it might break with future versions. I'm interested in modifying the color. Can the color be provided as an option just likeshowSpinner`? Or is there a better way?