Sunnyside Responsive Website

-Is there a reason why on chrome-based browsers there's a horizontal scrollbar and not on firefox? -I can't seem to apply properly the object-fit property. I've been stuck trying to make it work but no luck. I think object-fit suppose to fit the image inside the div tags and the aspect ratio wouldn't be affected. And there are excess margin on every of image's parent div. Is there a better way to do those?