<div class="row">
    <div class="col-xs-12  col-sm-6">
      [text* your-name placeholder "Ihr Name"] 
      [text your-subject placeholder "Betreff"]
    </div>
    <div class="col-xs-12  col-sm-6">
      [email* your-email placeholder "E-Mail Adresse"]
      [date* your-date placeholder "Datum auswählen"]
    </div>
    <div class="col-xs-12  col-sm-12">
      [textarea your-message placeholder "Ihre Nachricht"]
      [submit class:btn class:btn-primary "Senden"]
    </div>
</div>