粗犷主义返回顶部按钮
返回顶部按钮组件，采用粗犷主义风格，三原色方案，并具有复杂的复杂性。响应式设计支持黑暗主题。不使用JavaScript。
HTML 代码
<a href="#" class="fixed bottom-4 right-4 bg-red-500 dark:bg-cyan-500 text-yellow-300 dark:text-magenta-500 p-4 rounded-full shadow-lg transform transition-transform duration-300 hover:scale-110 focus:outline-none focus:ring-4 focus:ring-red-500 dark:focus:ring-cyan-500 border-4 border-black dark:border-white z-50">
<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>
</a>