.shine-effect {
    position: absolute;
    top: -100%;
    left: -100%;
    width: 50%;
    height: 50%;
    background: rgba(255, 255, 255, 0.2);
    transform: rotate(30deg);
    transition: 0.5s;
}
.card-body:hover .shine-effect {
    top: 150%;
    left: 150%;
}