Use media queries... don't use media queries... whatever. Cycle2 doesn't care; it's the honeybadger of slideshows plugins. Most of the demos on this site use fluid slideshow designs where the slideshow size adjusts as the window is resized. This is accompolished by a simple style rule like this: .cycle-slideshow { width: 45% }. Your slideshows can be fixed-width or fluid-width, or they can adapt to media query breakpoints. You decide!