Is there a better way to modify SVGs from Octicons?

[Andre601]

I'm offering a site where people can get octicons with a different fill colour and/or size.
It's currently done by injecting the fill, width and height properties to the <svg> HTML, but I feel likt this isn't the best solution there is.

So I was wondering if someone here would have a better idea to resize and recolor the SVGs on the fly for the user to use.

Source: https://github.com/Andre601/octicons-col.vercel.app
Site: https://octicons.andre601.ch

I want to mention that I have barely to no knowledge with Javascript (which is used here). I only managed to edit the existing upstream with the help of a few other people, so beginner-friendly explanations would be greatly apreciated.