form and button cropped

Hi everyone!

I’m using slick contact form but there’s one tiny detail I’d like to improve. When the form box is expanded it is 4 or 5 pixels cropped as well is the “send” button. You can check it here http://novo.apogeris.pt/

Would you please help me with this issue?

Thank you in advance!

https://wordpress.org/plugins/slick-contact-forms/