<link href="//maxcdn.bootstrapcdn.com/bootstrap/4.1.1/css/bootstrap.min.css" rel="stylesheet" id="bootstrap-css">
<script src="//maxcdn.bootstrapcdn.com/bootstrap/4.1.1/js/bootstrap.min.js"></script>
<script src="//cdnjs.cloudflare.com/ajax/libs/jquery/3.2.1/jquery.min.js"></script>
<div class="container">
<h2> Grid- Gap 1</h2>
<div class="grid-container">
<div class="grid-item">1</div>
<div class="grid-item">2</div>
<div class="grid-item">3</div>
<div class="grid-item">4</div>
<div class="grid-item">5</div>
<div class="grid-item">6</div>
<div class="grid-item">7</div>
<div class="grid-item">8</div>
<div class="grid-item">9</div>
</div>
<br/>
<h2> Grid- Gap 2</h2>
<div class="grid-container2">
<div class="grid-item2">1</div>
<div class="grid-item2">2</div>
<div class="grid-item2">3</div>
<div class="grid-item2">4</div>
<div class="grid-item2">5</div>
<div class="grid-item2">6</div>
<div class="grid-item2">7</div>
<div class="grid-item2">8</div>
</div>
</div>
