ナビゲーションコンポーネント

                <nav class="bg-gray-900 text-white p-4 flex justify-between items-center">
    <div class="flex items-center space-x-4">
        <img src="https://picsum.photos/50/50" alt="Logo" class="w-10 h-10 rounded-full">
        <span class="text-xl font-semibold">My Website</span>
    </div>
    <div class="hidden md:flex space-x-4">
        <a href="#" class="hover:text-gray-400 transition duration-200">Home</a>
        <a href="#" class="hover:text-gray-400 transition duration-200">About</a>
        <a href="#" class="hover:text-gray-400 transition duration-200">Services</a>
        <a href="#" class="hover:text-gray-400 transition duration-200">Contact</a>
    </div>
    <div class="relative">
        <img src="https://randomuser.me/api/portraits/men/1.jpg" alt="User Avatar" class="w-10 h-10 rounded-full cursor-pointer">
        <div class="absolute right-0 mt-2 w-48 bg-gray-800 text-white rounded-md shadow-lg hidden group-hover:block">
            <a href="#" class="block px-4 py-2 hover:bg-gray-700">Profile</a>
            <a href="#" class="block px-4 py-2 hover:bg-gray-700">Settings</a>
            <a href="#" class="block px-4 py-2 hover:bg-gray-700">Logout</a>
        </div>
    </div>
</nav>

<style>
    @media (prefers-color-scheme: dark) {
        body {
            background-color: #1a1a1a;
        }
    }
</style>

              

                <nav class="bg-white dark:bg-gray-800 shadow-lg">
    <div class="max-w-7xl mx-auto px-4 sm:px-6 lg:px-8">
        <div class="flex justify-between items-center h-16">
            <div class="flex-shrink-0">
                <img class="h-8 w-8 rounded-full" src="https://randomuser.me/api/portraits/men/1.jpg" alt="Avatar" />
            </div>
            <div class="hidden md:block">
                <div class="flex space-x-4">
                    <a href="#" class="text-gray-900 dark:text-white px-3 py-2 rounded-md text-sm font-medium hover:bg-gray-200 dark:hover:bg-gray-700 transition duration-200 ease-in-out">
                        Home
                    </a>
                    <a href="#" class="text-gray-900 dark:text-white px-3 py-2 rounded-md text-sm font-medium hover:bg-gray-200 dark:hover:bg-gray-700 transition duration-200 ease-in-out">
                        About
                    </a>
                    <a href="#" class="text-gray-900 dark:text-white px-3 py-2 rounded-md text-sm font-medium hover:bg-gray-200 dark:hover:bg-gray-700 transition duration-200 ease-in-out">
                        Services
                    </a>
                    <a href="#" class="text-gray-900 dark:text-white px-3 py-2 rounded-md text-sm font-medium hover:bg-gray-200 dark:hover:bg-gray-700 transition duration-200 ease-in-out">
                        Contact
                    </a>
                </div>
            </div>
            <div class="-mr-2 flex md:hidden">
                <button class="bg-gray-800 inline-flex items-center justify-center p-2 rounded-md text-gray-400 hover:text-white hover:bg-gray-700 focus:outline-none focus:ring-2 focus:ring-offset-2 focus:ring-offset-gray-800 focus:ring-white">
                    <span class="sr-only">Open main menu</span>
                    <svg class="h-6 w-6" xmlns="http://www.w3.org/2000/svg" fill="none" viewBox="0 0 24 24" stroke="currentColor">
                        <path stroke-linecap="round" stroke-linejoin="round" stroke-width="2" d="M4 6h16M4 12h16m-7 6h7" />
                    </svg>
                </button>
            </div>
        </div>
    </div>
    <div class="md:hidden">
        <div class="px-2 pt-2 pb-3 space-y-1 sm:px-3">
            <a href="#" class="text-gray-900 dark:text-white block px-3 py-2 rounded-md text-base font-medium hover:bg-gray-200 dark:hover:bg-gray-700 transition duration-200 ease-in-out">
                Home
            </a>
            <a href="#" class="text-gray-900 dark:text-white block px-3 py-2 rounded-md text-base font-medium hover:bg-gray-200 dark:hover:bg-gray-700 transition duration-200 ease-in-out">
                About
            </a>
            <a href="#" class="text-gray-900 dark:text-white block px-3 py-2 rounded-md text-base font-medium hover:bg-gray-200 dark:hover:bg-gray-700 transition duration-200 ease-in-out">
                Services
            </a>
            <a href="#" class="text-gray-900 dark:text-white block px-3 py-2 rounded-md text-base font-medium hover:bg-gray-200 dark:hover:bg-gray-700 transition duration-200 ease-in-out">
                Contact
            </a>
        </div>
    </div>
</nav>
              

                <nav class="bg-gray-800">
  <div class="mx-auto max-w-7xl px-2 sm:px-6 lg:px-8">
    <div class="relative flex h-16 items-center justify-between">
      <div class="absolute inset-y-0 left-0 flex items-center sm:hidden">
        <!-- Mobile menu button-->
        <button type="button" class="inline-flex items-center justify-center rounded-md p-2 text-gray-400 hover:bg-gray-700 hover:text-white focus:outline-none focus:ring-2 focus:ring-inset focus:ring-white" aria-controls="mobile-menu" aria-expanded="false">
          <span class="sr-only">Open main menu</span>
          <svg class="block h-6 w-6" fill="none" viewBox="0 0 24 24" stroke-width="1.5" stroke="currentColor" aria-hidden="true">
            <path stroke-linecap="round" stroke-linejoin="round" d="M3.75 6.75h16.5M3.75 12h16.5m-3.75 17.25h16.5" />
          </svg>
          <svg class="hidden h-6 w-6" fill="none" viewBox="0 0 24 24" stroke-width="1.5" stroke="currentColor" aria-hidden="true">
            <path stroke-linecap="round" stroke-linejoin="round" d="M6 18L18 6M6 6l12 12" />
          </svg>
        </button>
      </div>
      <div class="flex flex-1 items-center justify-center sm:items-stretch sm:justify-start">
        <div class="flex flex-shrink-0 items-center">
          <img class="block h-8 w-auto lg:hidden" src="https://tailwindui.com/img/logos/mark.svg?color=indigo&shade=500" alt="Your Company">
          <img class="hidden h-8 w-auto lg:block" src="https://tailwindui.com/img/logos/mark.svg?color=indigo&shade=500" alt="Your Company">
        </div>
        <div class="hidden sm:ml-6 sm:block">
          <div class="flex space-x-4">
            <!-- Current: "bg-gray-900 text-white", Default: "text-gray-300 hover:bg-gray-700 hover:text-white" -->
            <a href="#" class="bg-gray-900 text-white rounded-md px-3 py-2 text-sm font-medium" aria-current="page">Dashboard</a>
            <a href="#" class="text-gray-300 hover:bg-gray-700 hover:text-white rounded-md px-3 py-2 text-sm font-medium">Team</a>
            <a href="#" class="text-gray-300 hover:bg-gray-700 hover:text-white rounded-md px-3 py-2 text-sm font-medium">Projects</a>
            <a href="#" class="text-gray-300 hover:bg-gray-700 hover:text-white rounded-md px-3 py-2 text-sm font-medium">Calendar</a>
          </div>
        </div>
      </div>
      <div class="absolute inset-y-0 right-0 flex items-center pr-2 sm:static sm:inset-auto sm:ml-6 sm:pr-0">
        <button type="button" class="rounded-full bg-gray-800 p-1 text-gray-400 hover:text-white focus:outline-none focus:ring-2 focus:ring-white focus:ring-offset-2 focus:ring-offset-gray-800">
          <span class="sr-only">View notifications</span>
          <svg class="h-6 w-6" fill="none" viewBox="0 0 24 24" stroke-width="1.5" stroke="currentColor" aria-hidden="true">
            <path stroke-linecap="round" stroke-linejoin="round" d="M14.857 17.082a23.848 23.848 0 005.454-1.31A8.967 8.967 0 0118 9.75v-.7V9A6 6 0 006 9v.75a8.967 8.967 0 01-2.312 6.022c1.733.64 3.56 1.085 5.455 1.31m5.714 0a24.248 24.248 0 01-5.714 0m5.714 0a3 3 0 11-5.714 0" />
          </svg>
        </button>

        <!-- Profile dropdown -->
        <div class="relative ml-3">
          <div>
            <button type="button" class="flex rounded-full bg-gray-800 text-sm focus:outline-none focus:ring-2 focus:ring-white focus:ring-offset-2 focus:ring-offset-gray-800" id="user-menu-button" aria-expanded="false" aria-haspopup="true">
              <span class="sr-only">Open user menu</span>
              <img class="h-8 w-8 rounded-full" src="https://images.unsplash.com/photo-1472099645785-5658abf4ff4e?ixlib=rb-1.2.1&ixid=eyJhcHBfaWQiOjEyMDd9&auto=format&fit=facearea&facepad=2&w=256&h=256&q=80" alt="">
            </button>
          </div>

          <!--
            Dropdown menu, show/hide based on menu state.

            Entering: "transition ease-out duration-100"
              From: "transform opacity-0 scale-95"
              To: "transform opacity-100 scale-100"
            Leaving: "transition ease-in duration-75"
              From: "transform opacity-100 scale-100"
              To: "transform opacity-0 scale-95"
          -->
          <div class="absolute right-0 z-10 mt-2 w-48 origin-top-right rounded-md bg-white py-1 shadow-lg ring-1 ring-black ring-opacity-5 focus:outline-none" role="menu" aria-orientation="vertical" aria-labelledby="user-menu-button" tabindex="-1">
            <!-- Active: "bg-gray-100", Not Active: "" -->
            <a href="#" class="block px-4 py-2 text-sm text-gray-700" role="menuitem" tabindex="-1" id="user-menu-item-0">Your Profile</a>
            <a href="#" class="block px-4 py-2 text-sm text-gray-700" role="menuitem" tabindex="-1" id="user-menu-item-1">Settings</a>
            <a href="#" class="block px-4 py-2 text-sm text-gray-700" role="menuitem" tabindex="-1" id="user-menu-item-2">Sign out</a>
          </div>
        </div>
      </div>
    </div>
  </div>

  <!-- Mobile menu, show/hide based on menu state. -->
  <div class="sm:hidden" id="mobile-menu">
    <div class="space-y-1 px-2 pb-3 pt-2">
      <!-- Current: "bg-gray-900 text-white", Default: "text-gray-300 hover:bg-gray-700 hover:text-white" -->
      <a href="#" class="bg-gray-900 text-white block rounded-md px-3 py-2 text-base font-medium" aria-current="page">Dashboard</a>
      <a href="#" class="text-gray-300 hover:bg-gray-700 hover:text-white block rounded-md px-3 py-2 text-base font-medium">Team</a>
      <a href="#" class="text-gray-300 hover:bg-gray-700 hover:text-white block rounded-md px-3 py-2 text-base font-medium">Projects</a>
      <a href="#" class="text-gray-300 hover:bg-gray-700 hover:text-white block rounded-md px-3 py-2 text-base font-medium">Calendar</a>
    </div>
  </div>
</nav>
              

                <nav class="bg-white dark:bg-gray-800 shadow-md p-4 rounded-md flex justify-between items-center transition-all duration-300">
    <div class="flex items-center space-x-4">
        <img src="https://picsum.photos/40" alt="User Avatar" class="rounded-full transition-transform transform hover:scale-110 duration-300">
        <h1 class="text-lg font-semibold text-gray-800 dark:text-gray-200">My Website</h1>
    </div>
    <div class="flex space-x-4">
        <a href="#" class="text-gray-600 dark:text-gray-400 hover:text-blue-500 dark:hover:text-blue-400 transition duration-300 p-2 rounded-md">Home</a>
        <a href="#" class="text-gray-600 dark:text-gray-400 hover:text-blue-500 dark:hover:text-blue-400 transition duration-300 p-2 rounded-md">About</a>
        <a href="#" class="text-gray-600 dark:text-gray-400 hover:text-blue-500 dark:hover:text-blue-400 transition duration-300 p-2 rounded-md">Services</a>
        <a href="#" class="text-gray-600 dark:text-gray-400 hover:text-blue-500 dark:hover:text-blue-400 transition duration-300 p-2 rounded-md">Contact</a>
    </div>
</nav>

              

                <nav class="bg-gray-200 dark:bg-gray-800 rounded-lg shadow-lg p-4">
    <div class="flex justify-between items-center">
        <a href="#" class="flex items-center">
            <img src="https://picsum.photos/40" alt="Logo" class="rounded-full mr-2">
            <span class="text-lg font-bold text-gray-800 dark:text-gray-200">MyApp</span>
        </a>
        <div class="hidden md:flex space-x-4">
            <a href="#" class="text-gray-600 dark:text-gray-300 hover:text-gray-800 dark:hover:text-white transition duration-300">Home</a>
            <a href="#" class="text-gray-600 dark:text-gray-300 hover:text-gray-800 dark:hover:text-white transition duration-300">About</a>
            <a href="#" class="text-gray-600 dark:text-gray-300 hover:text-gray-800 dark:hover:text-white transition duration-300">Services</a>
            <a href="#" class="text-gray-600 dark:text-gray-300 hover:text-gray-800 dark:hover:text-white transition duration-300">Contact</a>
        </div>
        <div class="md:hidden flex items-center">
            <button class="text-gray-600 dark:text-gray-300 hover:text-gray-800 dark:hover:text-white transition duration-300">
                <img src="https://randomuser.me/api/portraits/thumb/men/1.jpg" alt="User Avatar" class="rounded-full w-10 h-10">
            </button>
        </div>
    </div>
    <div class="mt-2 md:hidden">
        <a href="#" class="block text-gray-600 dark:text-gray-300 hover:text-gray-800 dark:hover:text-white transition duration-300">Home</a>
        <a href="#" class="block text-gray-600 dark:text-gray-300 hover:text-gray-800 dark:hover:text-white transition duration-300">About</a>
        <a href="#" class="block text-gray-600 dark:text-gray-300 hover:text-gray-800 dark:hover:text-white transition duration-300">Services</a>
        <a href="#" class="block text-gray-600 dark:text-gray-300 hover:text-gray-800 dark:hover:text-white transition duration-300">Contact</a>
    </div>
</nav>