simple CSS lightbox effect

image css lightbox effect.html

<!-- //original: https://codepen.io/gschier/pen/HCoqh -->


<!-- thumbnail image wrapped in a link -->
<a href="#img1">
  <img src="http://insomnia.rest/images/screens/main.png" class="thumbnail">
</a>
<a href="#img2">
  <img src="http://via.placeholder.com/1350x1150" class="thumbnail">
</a>
<!-- lightbox container hidden with CSS -->
<a href="#" class="lightbox" id="img1">
  <img src="http://insomnia.rest/images/screens/main.png">
</a>
<a href="#" class="lightbox" id="img2">
  <img src="http://via.placeholder.com/1350x1150">
</a>

<!--css-->
<style>
  

.thumbnail {
  max-width: 20%;
}
/** LIGHTBOX MARKUP **/

.lightbox {
	/** Default lightbox to hidden */
	display: none;
	/** Position and style */
	position: fixed;
	z-index: 999;
	width: 100%;
	height: 100%;
	text-align: center;
	top: 0;
	left: 0;
	background: rgba(0,0,0,0.8);
}

.lightbox img {
	/** Pad the lightbox image */
	max-width: 90%;
	max-height: 90%;
	margin: 5%;
}

.lightbox:target {
	/** Remove default browser outline */
	outline: none;
	/** Unhide lightbox **/
	display: block;
}
</style>