<div class="d-flex flex-md-row">
  <div class="mr-auto p-2">
    <input type="button" value="Group 1"/>
    <input type="button" value="Group 1"/>
  </div>
  <div class="p-2">
    <input type="button" value="Group 2"/>
    <input type="button" value="Group 2"/>
  </div>
</div>