<div>
<strong style="margin-bottom:21px;display:block;">How old are you?</strong>
<ul>
  <li>
    <div class="checkbox"><label class="">
      <input type="radio" name="poll">less than 18 years
    </label></div>
  </li>
  <li>
    <div class="checkbox"><label class="">
      <input type="radio" name="poll">18-24 years
    </label></div>
  </li>
  <li>
    <div class="checkbox"><label class="">
      <input type="radio" name="poll">24-30 years
    </label></div>
  </li>
  <li>
    <div class="checkbox"><label class="">
      <input type="radio" name="poll">30-40 years
    </label></div>
  </li>
  <li>
    <div class="checkbox"><label class="">
      <input type="radio" name="poll">More than 40 years
    </label></div>
  </li>
</ul>
<div class="action">
<button class="btn btn-default">Vote</button>
</div>
</div>