粗野主义返回顶部按钮

<button class="fixed bottom-5 right-5 bg-black text-lime-400 border-4 border-lime-400 p-4 text-xl font-bold uppercase transition-all duration-300 hover:bg-lime-400 hover:text-black dark:bg-lime-400 dark:text-black dark:border-black dark:hover:bg-black dark:hover:text-lime-400">
    TOP
</button>