<link href="//netdna.bootstrapcdn.com/bootstrap/3.2.0/css/bootstrap.min.css" rel="stylesheet" id="bootstrap-css">
<script src="//netdna.bootstrapcdn.com/bootstrap/3.2.0/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-xs-12">
<form style="display:table; max-width: 350px;">
<div class="" style="display:table-cell; border-collapse: collapse; width: 50%;">
<input type="text" class="form-control" value="email">
</div>
<div class="" style="display:table-cell; border-collapse: collapse; width: 50%;">
<input type="text" class="form-control" value="email">
</div>
<div style="display: table-cell; border-collapse: collapse;">
<button type="button" class="btn btn-success btn-add">+</button>
</div>
</form>
</div>
</div>
</div>
