.topnav {
    overflow: hidden;
    background-color: #2277AA;
    text-align: center;
	filter: drop-shadow(0px -5px 5px rgba(0,0,0,.5));
}

    .topnav a {
        display: inline-block;
        *display: inline; /* ie7 fix */
        zoom: 1; /* hasLayout ie7 trigger */
        color: #f2f2f2;
        text-align: center;
        padding: 14px 16px;
        text-decoration: none;
        font-size: 17px;
    }

        .topnav a:hover {
            background-color: #ddd;
            color: black;
        }

    .topnav .icon {
        display: none;
        width: 50px;
        height: 50px;
        overflow: hidden;
    }

@media screen and (max-width: 1000px) {
    .topnav a {
        display: none;
    }

        .topnav a.icon {
            float: right;
            display: block;
        }
}

@media screen and (max-width: 1000px) {
    .topnav.responsive {
        position: relative;
    }

        .topnav.responsive .icon {
            position: absolute;
            right: 0;
            top: 0;
        }

        .topnav.responsive a {
            float: none;
            display: block;
            text-align: center;
        }
}