Hover Effect for Images

.imageblock img {
    transition:
        transform   0.4s ease-in-out,
        box-shadow  0.4s ease-in-out,
        filter      0.4s ease-in-out;
    will-change: transform, box-shadow, filter;
}

/* Image rotation & glow on hover */
.imageblock:hover img {
    transform: scale(1.05) rotate(1deg);
    box-shadow:
        0 0  50px rgba(0, 255, 255, 0.5),
        0 0 100px rgba(139,   0, 255, 0.3);
    filter: contrast(1.2) saturate(1.2);
}