<link href="//maxcdn.bootstrapcdn.com/bootstrap/4.1.1/css/bootstrap.min.css" rel="stylesheet" id="bootstrap-css">
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<div class="container">
<div class="row">
<div class="col-lg-3 col-md-4 col-sm-6" data-toggle="modal" data-target="#modal">
<a href="#lightbox" data-slide-to="0"><img src="https://dummyimage.com/160x120/000000/fff.png&text=Photo+1" class="img-thumbnail my-3"></a>
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<a href="#lightbox" data-slide-to="4"><img src="https://dummyimage.com/160x120/000000/fff.png&text=Photo+5" class="img-thumbnail my-3"></a>
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<a href="#lightbox" data-slide-to="5"><img src="https://dummyimage.com/160x120/000000/fff.png&text=Photo+6" class="img-thumbnail my-3"></a>
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