@tuanphan #2 worked great, thank you!
For #1, we just want the slideshow to appear bigger on mobile so that it fills up more of the screen and visitors to the mobile site won't have to zoom in to see the pictures. For instance, in the screenshot above, if the first photo could fill up most of the screen. Then only a small portion of the next image in the slideshow would show to the right of the first image.