Sticky Navigation (Glassmorphism)

<nav class="sticky top-0 z-10 backdrop-filter backdrop-blur-lg bg-opacity-30 bg-white shadow-lg">
  <div class="max-w-6xl mx-auto px-4">
    <div class="flex justify-between items-center h-16">
      <div class="flex-shrink-0">
        <span class="text-2xl font-semibold text-gray-900 dark:text-white">Glassmorphism Nav</span>
      </div>
      <div class="hidden md:block">
        <a href="#" class="text-gray-700 dark:text-gray-200 hover:text-gray-900 dark:hover:text-white px-3 py-2 rounded-md text-sm font-medium">Home</a>
        <a href="#" class="text-gray-700 dark:text-gray-200 hover:text-gray-900 dark:hover:text-white px-3 py-2 rounded-md text-sm font-medium">About</a>
        <a href="#" class="text-gray-700 dark:text-gray-200 hover:text-gray-900 dark:hover:text-white px-3 py-2 rounded-md text-sm font-medium">Services</a>
        <a href="#" class="text-gray-700 dark:text-gray-200 hover:text-gray-900 dark:hover:text-white px-3 py-2 rounded-md text-sm font-medium">Contact</a>
      </div>
      <div class="-mr-2 flex md:hidden">
        <button type="button" class="bg-gray-100 dark:bg-gray-700 inline-flex items-center justify-center p-2 rounded-md text-gray-400 hover:text-gray-500 hover:bg-gray-200 dark:hover:text-gray-300 dark:hover:bg-gray-600 focus:outline-none focus:ring-2 focus:ring-inset focus:ring-indigo-500" aria-controls="mobile-menu" aria-expanded="false">
          <span class="sr-only">Open main menu</span>
          <svg class="block h-6 w-6" xmlns="http://www.w3.org/2000/svg" fill="none" viewBox="0 0 24 24" stroke="currentColor" aria-hidden="true">
            <path stroke-linecap="round" stroke-linejoin="round" stroke-width="2" d="M4 6h16M4 12h16M4 18h16" />
          </svg>
          <svg class="hidden h-6 w-6" xmlns="http://www.w3.org/2000/svg" fill="none" viewBox="0 0 24 24" stroke="currentColor" aria-hidden="true">
            <path stroke-linecap="round" stroke-linejoin="round" stroke-width="2" d="M6 18L18 6M6 6l12 12" />
          </svg>
        </button>
      </div>
    </div>
  </div>

  <div class="md:hidden" id="mobile-menu">
    <div class="px-2 pt-2 pb-3 space-y-1 sm:px-3">
      <a href="#" class="text-gray-700 dark:text-gray-200 hover:text-gray-900 dark:hover:text-white block px-3 py-2 rounded-md text-base font-medium">Home</a>
      <a href="#" class="text-gray-700 dark:text-gray-200 hover:text-gray-900 dark:hover:text-white block px-3 py-2 rounded-md text-base font-medium">About</a>
      <a href="#" class="text-gray-700 dark:text-gray-200 hover:text-gray-900 dark:hover:text-white block px-3 py-2 rounded-md text-base font-medium">Services</a>
      <a href="#" class="text-gray-700 dark:text-gray-200 hover:text-gray-900 dark:hover:text-white block px-3 py-2 rounded-md text-base font-medium">Contact</a>
    </div>
  </div>
</nav>