Carousel Banner doesn't resize on mobile

Good morning. I have a bit of an urgent problem. We're ready to relaunch a client website except the leaderboard banners are not resizing on mobile devices. I've tried the alternative layout (flexisel), but there's no change. Hoping there's a quick solution.

Thanks in advance!
The discussion has been locked.
Discussions are now locked. You will not be able to reply to this discussion