Back to Top Button 组件
响应式“Back to Top”按钮组件，采用 Material Design 原则、柔和的颜色和深色模式支持，适用于博客或内容消费网站。
HTML 代码
<div class="fixed bottom-4 right-4 z-50">
<button
onclick="window.scrollTo({top: 0, behavior: 'smooth'});"
class="hidden md:flex items-center justify-center w-12 h-12 rounded-full shadow-lg bg-gray-200 dark:bg-gray-700 text-gray-700 dark:text-gray-200
hover:bg-gray-300 dark:hover:bg-gray-600 focus:outline-none focus:ring-2 focus:ring-gray-400 dark:focus:ring-gray-500
transition-all duration-300 ease-in-out transform hover:scale-110"
aria-label="Back to top"
>
<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="M5 10l7-7m0 0l7 7m-7-7v18"
></path>
</svg>
</button>
</div>