I've installed a MailChimp form on this site: http://www.workingmanfitness.com.
The one that has the issue is the header form on the home page, which is coded (not a plugin). Everything is fine EXCEPT the input field for the email address just blasts off the right side of the page when you view it on mobile.
I tried to set the width to 100%, but that didn't fix it. Can anyone give me any insight here?
I've already contacted MailChimp directly and as usual, they are useless when you ask them anything about code.