main > section:first-child {
    background: radial-gradient(circle, var(--bs-body-bg) 0%, var(--bs-secondary-bg) 75%, var(--bs-body-bg) 100%);
}

img.card-img-top {
    width: 100%;
    height: 15vw;
    object-fit: contain;
}

@media screen and (max-width: 600px) {
    img.card-img-top {
        height: 30vw;
    }
}