<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>
<form class="livedemo">
<input placeholder="Enter your email" id="two" required type="email" title="Please enter the valid email format (e.g. example@email.com)" x-moz-errormessage="Please enter the valid email format (e.g. example@email.com)" />
<button>submit</button>
</form>
