HTML 代码
<div class="relative w-full md:w-64">
<button class="flex items-center justify-between w-full px-4 py-2 text-gray-700 bg-white border border-gray-300 rounded-md shadow-sm dark:bg-gray-800 dark:text-gray-200 dark:border-gray-600 focus:outline-none focus:ring-2 focus:ring-indigo-500 focus:ring-offset-2 focus:ring-offset-gray-100" id="options-menu" aria-haspopup="true" aria-expanded="true">
<span>Options</span>
<svg class="w-5 h-5 -mr-1" xmlns="http://www.w3.org/2000/svg" viewBox="0 0 20 20" fill="currentColor" aria-hidden="true">
<path fill-rule="evenodd" d="M5.293 7.293a1 1 0 011.414 0L10 10.586l3.293-3.293a1 1 0 111.414 1.414l-4 4a1 1 0 01-1.414 0l-4-4a1 1 0 010-1.414z" clip-rule="evenodd" />
</svg>
</button>
<div class="absolute right-0 w-full mt-2 origin-top-right bg-white rounded-md shadow-lg ring-1 ring-black ring-opacity-5 dark:bg-gray-800 hidden" role="menu" aria-orientation="vertical" aria-labelledby="options-menu">
<div class="py-1">
<a href="#" class="block px-4 py-2 text-sm text-gray-700 hover:bg-indigo-500 hover:text-white dark:text-gray-200 dark:hover:bg-indigo-600" role="menuitem">Account settings</a>
<a href="#" class="block px-4 py-2 text-sm text-gray-700 hover:bg-indigo-500 hover:text-white dark:text-gray-200 dark:hover:bg-indigo-600" role="menuitem">Support</a>
<a href="#" class="block px-4 py-2 text-sm text-gray-700 hover:bg-indigo-500 hover:text-white dark:text-gray-200 dark:hover:bg-indigo-600" role="menuitem">License</a>
<form method="POST" action="#">
<button type="submit" class="block w-full px-4 py-2 text-sm text-left text-gray-700 hover:bg-indigo-500 hover:text-white dark:text-gray-200 dark:hover:bg-indigo-600" role="menuitem">Sign out</button>
</form>
</div>
</div>
</div>