<link href="//netdna.bootstrapcdn.com/bootstrap/3.0.0/css/bootstrap.min.css" rel="stylesheet" id="bootstrap-css">
<script src="//netdna.bootstrapcdn.com/bootstrap/3.0.0/js/bootstrap.min.js"></script>
<script src="//code.jquery.com/jquery-1.11.1.min.js"></script>
<link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/fancybox/3.2.5/jquery.fancybox.min.css"/>
<link href="https://maxcdn.bootstrapcdn.com/font-awesome/4.2.0/css/font-awesome.min.css" rel="stylesheet">
<link rel="stylesheet" href="css/style.css">
<section class="portfolio" id="portfolio">
<div class="container-fluid">
<div class="row">
<div class="gallery col-lg-12 col-md-12 col-sm-12 col-xs-12">
<h1 class="gallery-title">Gallery</h1>
</div>
<div align="center">
<button class="filter-button" data-filter="all">All</button>
<button class="filter-button" data-filter="category1">Designing</button>
<button class="filter-button" data-filter="category2">Development</button>
<button class="filter-button" data-filter="category3">Graphics</button>
</div>
<br/>
<div class="gallery_product col-sm-3 col-xs-6 filter category1">
<a class="fancybox" rel="ligthbox" href="https://picsum.photos/400/250?image=122">
<img class="img-responsive" alt="" src="https://picsum.photos/400/250?image=122" />
<div class='img-info'>
<h4>Image Title 1</h4>
<p>Lorem ipsum dolor sit amet, consectetur adipiscing elit.</p>
</div>
</a>
</div>
<div class="gallery_product col-sm-3 col-xs-6 filter category2">