Back to Top Button 组件
专为电子商务设计的响应式“Back to Top”按钮组件，在深色背景上具有鲜艳的配色方案。它包括一个微妙的悬停效果，并通过深色模式支持确保在所有屏幕大小的可见性。
HTML 代码
<div class="fixed bottom-4 right-4 z-50">
<a href="#top" class="group block p-3 rounded-full bg-gradient-to-br from-purple-600 to-indigo-500 shadow-lg transition-all duration-300 ease-in-out hover:from-purple-700 hover:to-indigo-600 focus:outline-none focus:ring-4 focus:ring-purple-300 dark:focus:ring-purple-800">
<svg class="w-6 h-6 text-white transform transition-transform duration-300 ease-in-out group-hover:-translate-y-1" 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="M5 10l7-7m0 0l7 7m-7-7v18"></path>
</svg>
<span class="sr-only">Back to Top</span>
</a>
</div>