Mailchimp form imported code looks different on some screens

Currently imported code from Mailchimp is being used to create a form on Webflow. I noticed the design look of the form seems to disappear on some device screens and then I only see the fields of the form instead. I would like the form to look the same across all devices and be responsive, if possible. I appreciate your suggestions. Here is the share link:

Here is my site Read-Only: LINK
(how to share your site Read-Only link)