static javascript and css files used by 3rd party

I have a 3rd party javascript that allows me to customize it using css and javascript…but it loads these from an URL which I can define.

Where should I put these files to be available for a GET like: localhost:8080/myTheme/theme.css or localhost:8080/myScripts/script.js

I can only customize name of myThem and myScripts paths.

thank you