Default Gallery
<> show code
<!-- Gallery image -->
<div class="col-md-4">
<div class="gallery-item">
<a href="img/elements/el9.jpg" data-fancybox="image">
<img src="img/elements/el9.jpg" alt="gallery">
</a>
</div>
</div>
Image gallery is made by Fancybox. Check the doucumentation for more details.