CSS CRT screen effect - Probably works best on Chrome <br />
You can play with the contents of the screen. Be sure to also play with the on/off switch <br/> 

<input type="checkbox" id="switch" checked>
<label for="switch" class="switch-label">Turn </label>

<div class="container">
  <iframe src="https://codepen.io" class="screen" width="800" height="600"></iframe>
  <div class="overlay">AV-1</div>
</div>