>

<p>
Instructions
<ul>
	<li>Click on the image to activate the viewer
	<li>Mouse drag: pan the image
	<li>Mouse wheel: zoom in/out
	<li>SHIFT+drag: change brightness
	<li>CTRL+drag: change saturation
	<li>q or ESC: exit the viewer (the scroll wheel loses its efect)
</ul>

<p>First image:
<div class="cpu" id="cpu1">
	<img src="http://gabarro.org/img/barbara.png">
</div>
<script>
	// get unique cpu element
	const cpu1 = document.getElementById("cpu1");

	// initialize state of this cpu element
	for (const c