<link href="//netdna.bootstrapcdn.com/twitter-bootstrap/2.3.2/css/bootstrap-combined.no-icons.min.css" rel="stylesheet">
<link href="//netdna.bootstrapcdn.com/font-awesome/3.2.1/css/font-awesome.css" rel="stylesheet">

<form name="signin" action="#" method="POST">
    <input type="text" name="text-input" placeholder="&#xf183; your username" class="stylish"/><br/>
    <input type="submit" value="&#xf090; sign in" class="stylish"/>
</form>