Custom image size / thumbnail – Crop to aspect ratio even when source image is smaller than set dimensions

This isn’t a really good solution since it’s a newer CSS solution and it’s only working in 78.9% of users browsers, but there are a few polyfills that can overcome that object-fit-images and fitie

img {
    display: block;
    overflow: hidden;
    width: 400px;
    height: 400px;
    -o-object-fit: cover;
       object-fit: cover;
}

Ideally it would be better if the smaller images scaled proportionally on upload, but I haven’t been able to figure out a solution for that.