Responsive Newsletter Sign-Up with an Amazing Animation

Hey man, if I understood correctly what you mean, you might want to give your <img> element a CSS property of "object-fit: cover". Provided that the <img> is contained within a <div> or whatever containing element, if this parent element changes in size, the img size will also change but always maintaining its aspect ratio (which means the image will get clipped if the parent element has a different aspect ratio, but the image won't get distorted). If the image is not a <img> element but rather a background image, you can use "background-image: cover". This link might be useful: https://www.bisign.es/css/

Also, if I may offer some extra advice, you might want to give your .newsletter a maximum width so that it doesn't stretch too much on large screens.

EDIT: one last detail: the email address shown in the success state does not match the address the user enters.