Base Apparel Coming Soon Page - Grid / Vanilla CSS & Javascript

With only two pictures I struggled to get a responsive desktop layout into a mobile view. I used Grid for the desktop with a breakpoint of 1400px and a mobile layout inside of 1400px. I set the image in it's own column with auto. The problem is, it wouldn't shrink down below 610px (the width of the picture). I could set a vw instead for the grid column and the picture would shrink but then the layout was a bit awkward. Looking for suggestions on how to best lay this out