Form

<form method="get" accept-charset="utf-8" id="phoneForm">
<div class="row"> 
  <div class="col-md-6"> 
    <label class="sr-only" for="winnerPhoneInput">Telefonnummer</label>
    <input id="winnerPhoneInput" type="tel" class="form-control" name="telephoneNumber" value="" required placeholder="Telefonnummer" maxlength="8" minlength="8">
  </div>
    <div class="col-md-6">
      <button class="btn btn-dialog btn-block" data-loading-text="Sender..." data-complete-text="Sendt!" autocomplete="off" id="submitPhone" type="submit">Send</button>
    </div>
  </div>
</form>