img.certificate {
    margin: clamp(.5rem, 1vw, 1.5rem);
    width: clamp(225px, 30vw, 325px);
    height: auto;
    box-shadow: 2px 2px 15px dimgray;
    }

    img.certificate:hover {
        box-shadow: 3px 3px 18px var(--color-copper); 
    }