/* Add a black background color to the top navigation */
.topnav {
    background-color: #1a222c;
    width: 100%;
    position: sticky;
    z-index: 2;
    top: 0;
    display: flex;
    align-items: center;
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
}

/* Style the links inside the navigation bar */
.topnav a {
    display: block;
    flex: 0 0 auto;
    color: #f2f2f2;
    text-align: center;
    padding: 14px 16px;
    text-decoration: none;
    font-size: 17px;
}

.topnav .icon {
  display: block;
  margin-left: auto;
}

/* Change the color of links on hover */
.topnav a:hover {
    background-color: #ddd;
    color: black;
}

/* Add a color to the active/current link */
.topnav a.active {
    background-color: #4CAF50;
    color: white;
}

@media screen and (max-width: 700px) {
  .topnav a {
    padding: 12px 13px;
    font-size: 15px;
  }

  .topnav .icon {
    margin-left: 0;
  }
}