Aspect Ratio for Bigcommerce Cornerstone HeroCarousel?

Our shop recently migrated to Cornerstone from another theme. The aspect ratio for our previous carousels is causing display issues with the Cornerstone Hero Carousel. Specifically, the image is expanding to cover the full width of the screen, which causes the carousel graphic to be cut off at the top and bottom.

What aspect ratio should we use when creating carousel graphics for use with Cornerstone?


Paste below CSS into footer script