Select with Submenu

Code Example

   <style>
    <form action="#">
     <select class="form-corners">
      <option value="0">Select car:</option>
      <optgroup label="Car" data-max-options="2">
      <option value="1">Saloon</option>
      <option value="2">Coupe</option>
      <option value="3">Estate</option>
      <optgroup label="Van" data-max-options="2">
      <option value="6">Astrovan</option>
      <option value="7">Windstar</option>
      <option value="8">Pacifica</option>
     </select>
    </form>
   </style>