.normal-image, .gif-image {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    transition: opacity 0.3s ease;
    object-fit:cover;
    display: flex;
}

.gif-image {
    opacity: 0;
    z-index: 1;
}

.normal-image{
    z-index: 3;
}

.grid-item:hover .gif-image {
    opacity: 1;
}

.grid-item:hover .normal-image {
    opacity: 0;
}

.overlay-image {
    background-image: radial-gradient(transparent, rgba(0,0,0,1));
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    position: absolute;
    z-index: 2;
 }