Any way to do a responsive container in ilightbox for joomla?

Hello, I’m trying to target specific ilightbox popups on my site. On some of these, I’d like the data-options size to be width: 1100 height: 700, but then at less than 850px wide I’d like the containers to fill the screen 100%. I’ve been trying different media queries, and nothing is working. Anyone have an idea?