.submenu-item.cta a {
  background-color: #223b62; /* your brand color */
  color: #fff;
  padding: 8px 14px;
  border-radius: 6px;
  font-weight: 600;
  display: inline-block;
}
.submenu-item.cta a:hover {
  background-color: #115c9b;
}