ನಾನು ಡಿವ್ ಪೂರ್ಣ ಪರದೆಯನ್ನು ಹೇಗೆ ಮಾಡುವುದು?

const elem = document.querySelector('#park-pic');

elem.addEventListener("click", function(e) {
  toggleFullScreen();
}, false);

function toggleFullScreen() {

  if (!document.fullscreenElement) {
    elem.requestFullscreen().catch(err => {
      alert(`Error attempting to enable full-screen mode: ${err.message} (${err.name})`);
    });
  } else {
    document.exitFullscreen();
  }
}

#container{
  border:1px solid #aaa;
  padding:10px;
}
#park-pic {
  width: 100%;
  max-height: 70vh;
}

<div id="container">
  <p>
    <a href="#" id="toggle-fullscreen">Toggle Fullscreen</a>
  </p>
  <img id="park-pic"
      src="https://storage.coverr.co/posters/Skate-park"></video>
</div>