@media (min-width: 992px){
    .dropdown-menu .dropdown-toggle:after{
        border-top: .3em solid transparent;
        border-right: 0;
        border-bottom: .3em solid transparent;
        border-left: .3em solid;
    }

    .dropdown-menu .dropdown-menu{
        margin-left:0; margin-right: 0;
    }

    .dropdown-menu li{
        position: relative;
    }
     .submenu{ 
        display: none;
        position: absolute;
        left:100%; top:-7px;
    }
     .submenu-left{ 
        right:100%; left:auto;
    }

    .dropdown-menu > li:hover{ background-color: #f1f1f1 }
    .dropdown-menu > li:hover > .submenu{
        display: block;
    }
}