[TxMt] Changing language for a specific file

Hi there, This may be a bit of a newbish question, but hopefully someone can answer it for me.

I have quite a few JSP files, but a couple of them contain almost solely CSS information (with some serverside info sprinkled in).

So, of course, I'd like those couple of files to be highlighted as CSS files, with the CSS bundle to be active for those files.

However, the issue I am running into is that whenever I select the language for that file, it sticks for all JSPs.

So what would be the best way to get those few files to be read as CSS, but keeping their same file names, etc?

Thanks in advance for all of your help,