diegodelfin7

  .dropdown-menu::before {
    border-bottom: 9px solid rgba(0, 0, 0, 0.2);
    border-left: 9px solid rgba(0, 0, 0, 0);
    border-right: 9px solid rgba(0, 0, 0, 0);
    content: "";
    display: inline-block;
    left: 86px;
    position: absolute;
    top: -8px;
}