.topnav {
    overflow: hidden;
    background-color: #f1f1f1;
}

    .topnav a {
        float: left;
        display: block;
        color: black;
        text-align: center;
       /* padding: 0px 0px;*/
        text-decoration: none;
        font-size: 12px;
        width:78px;
        border-bottom: 3px solid transparent;
    }

        .topnav a:hover {
            border-bottom: 3px solid #000000;
        }

        .topnav a.active {
            border-bottom: 3px solid #000000;
        }

#panel-heading{
    margin-top:0px;
}