.qr-gallery {
    column-count: 3;
    column-gap: 1em;
}
.qr-gallery a {
    display: inline-block;
    margin-bottom: 1em;
    width: 100%;
}
.qr-gallery img {
    width: 100%;
    height: auto;
    border-radius: 8px;
    box-shadow: 0 2px 8px rgba(0,0,0,0.1);
}
@media (max-width: 768px) {
    .qr-gallery {
        column-count: 2;
    }
}
@media (max-width: 480px) {
    .qr-gallery {
        column-count: 1;
    }
}