Here is an example of a menu styled using Tailwind CSS classes:

<div class="relative w-64">
    <button
        class="block w-full text-left rounded-md text-gray-700 focus:outline-none focus:bg-gray-100 focus:text-gray-900">
        Menu
        <svg class="w-5 h-5 ml-auto" viewBox="0 0 20 20" fill="currentColor">
            <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="origin-top-right absolute right-0 mt-2 w-56 rounded-md shadow-lg">
        <div class="rounded-md bg-white shadow-xs">
            <a href="#"
               class="block px-4 py-2 text-sm leading-5 text-gray-700 hover:bg-gray-100 focus:outline-none focus:bg-gray-100 transition duration-150 ease-in-out">Option
                1</a>
            <a href="#"
               class="block px-4 py-2 text-sm leading-5 text-gray-700 hover:bg-gray-100 focus:outline-none focus:bg-gray-100 transition duration-150 ease-in-out">Option
                2</a>
            <a href="#"
               class="block px-4 py-2 text-sm leading-5 text-gray-700 hover:bg-gray-100 focus:outline-none focus:bg-gray-100 transition duration-150 ease-in-out">Option
                3</a>
            <a href="#"
               class="block px-4 py-2 text-sm leading-5 text-gray-700 hover:bg-gray-100 focus:outline-none focus:bg-gray-100 transition duration-150 ease-in-out">Option
                4</a>
        </div>
    </div>
</div>

In this example, the relative class positions the menu container relatively, the w-64 class sets the width of the container to 64 pixels