<link href="//maxcdn.bootstrapcdn.com/bootstrap/3.3.0/css/bootstrap.min.css" rel="stylesheet" id="bootstrap-css">
<script src="//maxcdn.bootstrapcdn.com/bootstrap/3.3.0/js/bootstrap.min.js"></script>
<script src="//code.jquery.com/jquery-1.11.1.min.js"></script>
<div class="container">
<div class="row">
<div class="col-md-6">
<h2>Custom search field</h2>
<div id="custom-search-input">
<div class="input-group col-md-12">
<input type="text" class="form-control input-lg" placeholder="Buscar" />
<span class="input-group-btn">
<button class="btn btn-info btn-lg" type="button">
<i class="glyphicon glyphicon-search"></i>
</button>
</span>
</div>
</div>
</div>
</div>
</div>