Ninja Forms - Align text area and submit button

I just put a simple email subscription form on my website using Ninja Forms Wordpress plugin. The submit button is under the text area. How to I make the submit button align to the right of the text area?

<div class="email-form-wrap">

<?php if( function_exists( 'ninja_forms_display_form' ) ){ ninja_forms_display_form( 22 ); } ?>

</div>

The class for the textarea is 'email-text-area'

The class for the submit button is 'email-sub'

via Chebli Mohamed