header button css code

I have customized buttons across my entire site to match my branding, but it has not adjusted in the header or in the form button. I have been experimenting with code, but nothing is working. What is the correct code to use here?

What is site url? We can check easier

blue-blue-6rrc.squarespace.com

Use this CSS for header button & form button

a.btn, input.button {
    font-family: 'corporate a pro' !important;
}

This worked! Thank you. Still struggling with the padding on the left and right to adjust. How do I increase more padding? I've tried:

a.btn, input.button {
    font-family: 'corporate a pro' !important;
    text-transform: capitalize !important;
    padding-bottom: 30 !important;
    padding-top: 30 !important;
    padding-left: 30 !important;
    padding-right: 30 !important;
}

and only the top and bottom padding adjust.

This worked! Thank you much