HTML 代码
<div class="fixed bottom-4 right-4">
<button class="bg-gradient-to-r from-purple-600 to-pink-600 text-white rounded-full p-3 shadow-lg hover:scale-110 transition-transform duration-300 dark:from-purple-800 dark:to-pink-800">
<svg xmlns="http://www.w3.org/2000/svg" class="h-6 w-6" fill="none" viewBox="0 0 24 24" stroke="currentColor">
<path stroke-linecap="round" stroke-linejoin="round" stroke-width="2" d="M12 4v16m0 0l-4-4m4 4l4-4" />
</svg>
</button>
</div>