<style>
  /* Hide submenu by default */
  .nav-item .submenu {
    display: none;
    position: absolute;
    background: white;
    padding: 0;
    margin: 0;
    list-style: none;
    border: 1px solid #ccc;
    min-width: 200px;
    z-index: 1000;
  }

  /* Show submenu when hovering over the parent <li> or submenu */
  .nav-item:hover .submenu {
    display: block;
  }

  /* Submenu link styles */
  .submenu li a {
    padding: 10px 15px;
    display: block;
    color: #333;
    text-decoration: none;
  }

  .submenu li a:hover {
    background-color: #f0f0f0;
  }

  /* Make sure parent <li> is positioned for absolute submenu */
  .nav-item {
    position: relative;
  }
</style>