<link href="//maxcdn.bootstrapcdn.com/bootstrap/4.0.0/css/bootstrap.min.css" rel="stylesheet" id="bootstrap-css">
<script src="//maxcdn.bootstrapcdn.com/bootstrap/4.0.0/js/bootstrap.min.js"></script>
<script src="//code.jquery.com/jquery-1.11.1.min.js"></script>
<!------ Include the above in your HEAD tag ---------->
<div class="container">
<div class="row">
<ul class="social-btns center-block">
<li><button class="btn btn-facebook"><i class="fa fa-facebook pull-left" aria-hidden="true"></i>Sign in with Facebook</button></li>
<li><button class="btn btn-twitter"><i class="fa fa-twitter pull-left" aria-hidden="true"></i>Sign in with Twitter</button></li>
<li><button class="btn btn-linkedin"><i class="fa fa-linkedin pull-left" aria-hidden="true"></i>Sign in with Linkedin</button></li>
<li><button class="btn btn-google"><i class="fa fa-google-plus pull-left" aria-hidden="true"></i>Sign in with Google</button></li>
<li><button class="btn btn-tumblr"><i class="fa fa-tumblr pull-left" aria-hidden="true"></i>Sign in with Tumblr</button></li>
<li><button class="btn btn-pinterest"><i class="fa fa-pinterest-p pull-left" aria-hidden="true"></i>Sign in with Pinterest</button></li>
</ul>
</div>
</div>
