<script>
  function openForm() {   document.getElementById("myForm").style.display = "block";  }

  function closeForm() {   document.getElementById("myForm").style.display = "none";  } </script>

<div class="form-popup" id="myForm">  <form action="/action_page.php" class="form-container">

   <iframe class="vid" src="http://playplex.de/videos/images/1.mp4" width="640" height="360" frameborder="0" controlls></iframe>   <button type="button" class="btn cancel" onclick="closeForm()">Schliessen</button>  </form> </div>