.mh-500{
    min-height: 500px;
}
#product-nav-item{
  display: none;
  width: 240px;  

}
@media (min-width:992px) {
    #product-nav-item{
        display: block;
    }
}
#product-nav-item .nav-link{
    background-color: dodgerblue;
    color: white;
}
#product-nav-item:hover #product-sub-nav{
    display: block;
}

#product-sub-nav{
    display: none;
    position: absolute;
    width: 240px;
    z-index: 1000;
    
}