I'm using a site that only lets me create new pages by editing them in an iframe. I want to use bootstrap in these, but the main site itself seems to be hosting (much) older versions of bootstrap that are overriding styles in my iframe.

After some googling, I used this method to block the main sites bootstrap CSS file: <script>$('link[rel=stylesheet][href~="URL of the main sites bootstrap.min.css file"]').remove();</script>

This worked at first, but then a different version of bootstrap (still very old) started overriding again. Instead of playing whack-a-mole, is there a way to simply block the entire folder that houses the main site's CSS files, instead of just a specific file?