Resize Header Button for Mobile

Site URL: https://annabelzicker.squarespace.com

Password: annabel

Hi,

I'm trying to resize the header "sign up" button for mobile view as it's quite large. Would love to make it smaller and not sure how. Thanks in advance!

Add to Home > Design > Custom CSS

@media screen and (max-width:767px) {
.header-menu-cta a {
    padding: 10px;
    font-size: 15px;
}
}