Is it not possible to use the @media function on spacehey?

I'd noticed because of the css I've used on my profile some content would get clipped at certain browser window sizes. I tried to fix it by introducing some new breakpoints with the @media function, yet they didn't seem to work. This seemed especially strange because the changes I made worked fine when I changed the css directly and inspect shows the website uses @media for breakpoints as well. Is there a specific reason to block it?