.img-add{
    top: 0;
    left: 0;
    height: 100%;
    width: 100%;
    position: absolute;
    display: none;
}
.img-fluid-c{
    margin-left: -70px;
    width: 150%;
}
.image{
    width: 100%;
    max-height: 300px;
}
.product-thumb:hover a .image .img-add{
    display: block;
}