fancybox
<!-- 1. Add latest jQuery and fancybox files -->
<script src="https://cdn.jsdelivr.net/npm/[email protected]/dist/jquery.min.js"></script>
<link rel="stylesheet" href="https://cdn.jsdelivr.net/gh/fancyapps/[email protected]/dist/jquery.fancybox.min.css" />
<script src="https://cdn.jsdelivr.net/gh/fancyapps/[email protected]/dist/jquery.fancybox.min.js"></script>
<!-- 2. Create links -->
<a data-fancybox="gallery" href="big_1.jpg"><img src="small_1.jpg"></a>
<a data-fancybox="gallery" href="big_2.jpg"><img src="small_2.jpg"></a>
<!-- 3. Have fun! -->