ナビゲーションバー

<nav class="bg-gray-800 text-white p-4">
    <div class="container mx-auto flex justify-between items-center">
        <div class="text-lg font-bold">Brand</div>
        <div class="hidden md:flex space-x-4">
            <a href="#" class="hover:text-gray-400">Home</a>
            <a href="#" class="hover:text-gray-400">About</a>
            <a href="#" class="hover:text-gray-400">Services</a>
            <a href="#" class="hover:text-gray-400">Contact</a>
        </div>
        <div class="md:hidden">
            <button class="text-white focus:outline-none" id="menu-btn">
                <svg class="w-6 h-6" fill="none" stroke="currentColor" viewBox="0 0 24 24" xmlns="http://www.w3.org/2000/svg">
                    <path stroke-linecap="round" stroke-linejoin="round" stroke-width="2" d="M4 6h16M4 12h16m-7 6h7"/>
                </svg>
            </button>
        </div>
    </div>
    <div class="md:hidden" id="menu" style="display: none;">
        <a href="#" class="block px-4 py-2 hover:bg-gray-700">Home</a>
        <a href="#" class="block px-4 py-2 hover:bg-gray-700">About</a>
        <a href="#" class="block px-4 py-2 hover:bg-gray-700">Services</a>
        <a href="#" class="block px-4 py-2 hover:bg-gray-700">Contact</a>
    </div>
</nav>

<!-- User Avatar Section -->
<div class="p-4 bg-gray-900">
    <div class="container mx-auto flex items-center">
        <img src="https://randomuser.me/api/portraits/men/1.jpg" alt="User Avatar" class="w-10 h-10 rounded-full">
        <span class="ml-2">User Name</span>
    </div>
</div>

<!-- Placeholder Image Section -->
<div class="p-4">
    <img src="https://picsum.photos/1920/1080" alt="Placeholder Image" class="w-full h-auto">
</div>