Submit Button on Right

Hi,
I am building a website and using the Contact form 7 plugin. For a particular part of the site, I have the CF7 widget, nested inside an element, which I am using for a Newsletter Subscriber. There is only one field which is for [email] and I want to place a submit button on the right of the field.
I have found several posts related to this and they all point to this link; https://contactform7.com/styling-contact-form/

However, this link makes no mention of moving the submit button, inline or to the right of the field.
So how do I put the button on the right?
Also, is it possible to use an icon or image instead of the standard ‘Send’ on the button?