<select class="mdb-select md-form">

  <option value="" disabled selected>Choose your option</option>

  <option value="1">Option 1</option>

  <option value="2">Option 2</option>

  <option value="3">Option 3</option>

  <option value="4">Option 4</option>

  <option value="5">Option 5</option>

  <option value="6">Option 6</option>

  <option value="7">Option 7</option>

  <option value="8">Option 8</option>

  <option value="9">Option 9</option>

  <option value="10">Option 10</option>

  <option value="11">Option 11</option>

  <option value="12">Option 12</option>

</select>