<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 href="https://stackpath.bootstrapcdn.com/font-awesome/4.7.0/css/font-awesome.min.css" rel="stylesheet" integrity="sha384-wvfXpqpZZVQGK6TAh5PVlGOfQNHSoD2xbE+QkPxCAFlNEevoEH3Sl0sibVcOQVnN" crossorigin="anonymous">
<div class="buscar-caja">
<input type="text" name="" class="buscar-txt" placeholder="Search ....."/>
<a class="buscar-btn"> <i class="fa fa-search"></i> </a>
</div>
<div class="wrap" style="text-align: center; color: #fff;">
<a href="http://opensnippets.com" target: "_blank" class="btn btn-primary">Download free bootstrap forms</a>
</div>