.fv{position:relative;width:min(calc(800 / 800 * 100vw),800px);height:min(calc(1278 / 800 * 100vw),1278px)}.fv video{width:min(calc(800 / 800 * 100vw),800px);height:min(calc(1280 / 800 * 100vw),1280px)}