.wp-block-button.is-style-outline .wp-element-button {
  box-shadow: var(--outline-button-box-shadow);
}
.wp-block-button.is-style-outline .wp-element-button:hover {
  color: var(--outline-button-hover-color);
  background-color: var(--outline-button-hover-background-color);
  box-shadow: var(--outline-button-hover-box-shadow);
  border-color: var(
    --outline-button-hover-border-color,
    var(--outline-button-hover-background-color)
  );
}