Misaligning Mailchimp Form

Hi,

The popup is working fine, however, when it appears on the same page as a Mailchimp form (which is the same code used in the Boxzilla popup), it is misaligning the form.

So the Mailchimp form on the bottom of the page (the input field and submit button) were centered on the page before the popup was added and are now left-aligned.

And the input box and button are centered on the popup, which is using the same Mailchimp code.

Please help me center get the input field and submit button centered on my page again.

The page I need help with: [log in to see the link]