Your demo site is not working.
I'm seeing the following errors in Chrome's web ispector:
Refused to execute script from 'https://raw.github.com/lukaszfiszer/selectnav.js/master/selectnav.min.js' because its MIME type ('text/plain') is not executable, and strict MIME type checking is enabled. lukaszfiszer.github.io/:1
Uncaught ReferenceError: selectnav is not defined lukaszfiszer.github.io/:23
Failed to load resource: the server responded with a status of 403 (Forbidden)
Your demo site is not working.
I'm seeing the following errors in Chrome's web ispector:
Refused to execute script from 'https://raw.github.com/lukaszfiszer/selectnav.js/master/selectnav.min.js' because its MIME type ('text/plain') is not executable, and strict MIME type checking is enabled. lukaszfiszer.github.io/:1
Uncaught ReferenceError: selectnav is not defined lukaszfiszer.github.io/:23
Failed to load resource: the server responded with a status of 403 (Forbidden)