<select name="" id="" class="border-gray-400 border-2 p-2 w-20 mt-10">
                <option value="">123</option>
            </select>

External CSS

  1. https://cdnjs.cloudflare.com/ajax/libs/tailwindcss/2.2.15/tailwind.min.css

External JavaScript

This Pen doesn't use any external JavaScript resources.