<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>
<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/4.1.3/css/bootstrap.min.css" />
<div class="container">
<h2 class="text-center">Buttons Style</h2>
<div class="row elements-page-btn mt-3">
<div class="col-md-8 col-sm-8 mx-auto text-center mb-5">
<button type="button" class="btn btn-primary">Primary</button>
<button type="button" class="btn btn-secondary">Secondary</button>
<button type="button" class="btn btn-success">Success</button>
<button type="button" class="btn btn-danger">Danger</button>
<button type="button" class="btn btn-warning">Warning</button>
<button type="button" class="btn btn-info">Info</button>
<button type="button" class="btn btn-light">Light</button>
<button type="button" class="btn btn-dark">Dark</button>
<button type="button" class="btn btn-link">Link</button>
</div>
<div class="col-md-7 col-sm-7 mx-auto text-center">
<button type="button" class="btn btn-primary btn-sm">Primary</button>
<button type="button" class="btn btn-secondary btn-sm">Secondary</button>
<button type="button" class="btn btn-success btn-sm">Success</button>
<button type="button" class="btn btn-danger btn-sm">Danger</button>
<button type="button" class="btn btn-warning btn-sm">Warning</button>
<button type="button" class="btn btn-info btn-sm">Info</button>
<button type="button" class="btn btn-light btn-sm">Light</button>
<button type="button" class="btn btn-dark btn-sm">Dark</button>
<button type="button" class="btn btn-link btn-sm">Link</button>
</div>
</div>
</div>
<div class="container">