.navbar-default .navbar-nav > .open > a:focus:before {
    border-top: 20px solid #f00;
    content: "";
    display: inline-block;
    left: 41%;
    position: absolute;
    top: 50px;
border-style: solid;
border-width: 8px 7px 0 7px;
border-color: #1a161a transparent transparent transparent;
z-index:1031
}