.wp-block-button.is-style-button-dark .wp-block-button__link {
  text-decoration: none;
  color: white;
  text-transform: uppercase;
  font-weight: bold;
  display: inline-block;
  padding: 1.2rem 2.5rem;
  background: #00376E;
  border: 2px solid #00376E;
  border-radius: .5rem;
  transition: .5s ease-out;
}

.wp-block-button.is-style-button-dark .wp-block-button__link:hover,
.wp-block-button.is-style-button-dark .wp-block-button__link:focus {
   background: white;
   color: #00376E;
 }

@media (max-width: 1199.98px) {
  .wp-block-button.is-style-button-dark .wp-block-button__link {
    font-size: 1.5rem;
  }
}

@media (max-width: 575.98px) {
  .wp-block-button.is-style-button-dark .wp-block-button__link {
    font-size: 1.4rem;
  }
}