Have a style sheet at the bottom of the page below some js. The js sets up lazy loading and changes all the image div id/classes so the style sheet does nothing

Have a style sheet at the bottom of the page below some js. The js sets up lazy loading and changes all the image div id/classes so the style sheet does nothing. The style sheet sets the image divs backgrounds to your images otherwise. That should still work without js. Although it's a mess to work with...