.topnav {
    background-color: #505050;
    overflow: hidden
}

.topnav a {
    float: left;
    color: #ffffff;
    text-align: center;
    font-family: "Gotham";
    padding: 14px 16px;
    text-decoration: none;
}

.topnav b {
    float: left;
    color: #ffffff;
    text-align: left;
    font-family: "Gotham";
    padding: 14px 16px;
    text-decoration: none;
    font-size: large;
}

.topnav a:hover {
    background-color: #505050;
    color: aqua;
}

.footer {
    position: fixed;
    left: 0;
    bottom: 0;
    width: 100%;
    background-color: #505050;
    color: white;
    text-align: center;
  }