HTML 代码
<div class="fixed bottom-5 right-5 z-50">
<button class="bg-gray-800 text-white rounded-full p-3 shadow-md hover:bg-gray-700 dark:bg-gray-300 dark:text-gray-800 dark:hover:bg-gray-400 transition-all duration-200">
<svg xmlns="http://www.w3.org/2000/svg" class="w-6 h-6" fill="none" viewBox="0 0 24 24" stroke="currentColor">
<path stroke-linecap="round" stroke-linejoin="round" stroke-width="2" d="M12 4v16m8-8H4" />
</svg>
</button>
</div>