Hi Jay
Okay, Kindly add the below CSS in the Additional CSS box, please go to the Appearance => Customize => Additional CSS then paste the CSS here and click on to publish button.
.site-footer .wp-block-button__link {
background: #FAB702;
border-radius: 0;
border: 2px solid #FAB702;
}
.site-footer .wp-block-button__link:hover, .site-footer .wp-block-button__link:focus{
background: #111;
color: #fff !important;
}
Let us know if it works.
Thanks