@media (max-width: 991px)
{
    #modal-store 
    {
        width: 560px;   
    }

    .store.content.row .store-column {
        height: 310px;
    }
    #modal-store .store.row .store-column:nth-child(n+4) .store-item, .store.content.row .store-column:nth-child(n+4) .store-item
    {
        border-bottom: 2px #06ace4 dotted; 
    }
    #modal-store .store.row .store-column:nth-child(n+5) .store-item, .store.content.row .store-column:nth-child(n+5) .store-item
    {
        border-bottom: 0px #06ace4 dotted; 
    }
    #modal-store .store.row .store-column:nth-child(3n+3), .store.content.row .store-column:nth-child(3n+3)
    {
       border-right: 2px #06ace4 solid;
    }
    #modal-store .store.row .store-column:nth-child(2n+2), .store.content.row .store-column:nth-child(2n+2)
    {
       border-right: 0px #06ace4 solid;
    }
}