.wp-block-button:not(.is-style-outline) .wp-block-button__link:not([class*=has-background]) {
  background-color: #020202;
  border-radius: 15px;
}
#wpforms-53136 button.btn-black-white {
  background-color: #000000;
}
#wpforms-53209 button.wpforms-submit {
  background-color: #686464;
}