Hello NataliaW4,   Thank you for reaching out to Constant Contact API Developer Support. My team is here to assist outside software developers with questions about building into Constant Contact's API.   We greatly appreciate your feedback regarding the customization options for our inline sign-up forms, as your experience and feedback are essential to improving our product. I’m sorry that our current customization options do not suit your use case. While inline forms can’t currently have their size or button sizes edited, there are options to edit the text and background colors of the forms.    I have tracked your account on an open feature request for the ability to modify the shape and size of our inline forms.   Please let us know if you have any other questions!   Regards, ... View more