.topnav {
    overflow: hidden;
    float: right;
    padding-right: 18px;
}
.topnav a {
    float: right;
    display: block;
    color: #ffffff;
    text-align: center;
    padding: 14px 16px;
    text-decoration: none;
    font-size: 15px;
    background-color: #0064a4;
}
.topnav a:hover {
    background-color: #fff;
    color: black;
}
.active {
    background-color: #4CAF50;
    color: white;
}
.topnav .icon {
    display: none;
}
@media screen and (max-width: 600px) {
    .topnav a {
        display: none;
    }
    .topnav a:first-child {
        margin-top: 79px;
    }
    .topnav a.icon {
        float: right;
        display: block;
    }
}
@media screen and (max-width: 600px) {
    .topnav.responsive {
        position: relative;
    }
    .topnav.responsive .icon {
        position: absolute;
        right: 0;
        top: 0;
    }
    .topnav.responsive a {
        float: none;
        display: block;
        text-align: left;
    }
}