Lightbox 2
These modular elements can be readily used and customized in every layout across pages.
For more detail see, Lightbox 2 Documentation
Stylesheet
<link href="assets/lib/lightbox2/css/lightbox.min.css" rel="stylesheet">Javascript
<script src="assets/lib/lightbox2/js/lightbox.min.js"></script>Example
<a href="../assets/img/gallery/g7.jpg" data-lightbox="Image" data-title="caption">
<img class="img-fluid rounded" src="../assets/img/gallery/g7.jpg" alt="">
</a>Gallery
<div class="row">
<div class="col-sm-4 mb-4 mb-lg-0">
<a href="../assets/img/gallery/g1.jpg" data-lightbox="group" data-title="caption"><img class="rounded img-fluid" src="../assets/img/gallery/g1.jpg" alt=""></a>
</div>
<div class="col-sm-4 mb-4 mb-lg-0">
<a href="../assets/img/gallery/g2.jpg" data-lightbox="group" data-title="caption"><img class="rounded img-fluid" src="../assets/img/gallery/g2.jpg" alt=""></a>
</div>
<div class="col-sm-4 mb-4 mb-lg-0">
<a href="../assets/img/gallery/g3.jpg" data-lightbox="group" data-title="caption"><img class="rounded img-fluid" src="../assets/img/gallery/g3.jpg" alt=""></a></div>
</div>