a.dark-button {
  background-color: #0c314b;
  color: white;
  text-decoration: none;
  padding: 15px 50px;
  display: inline-block;
  border-radius: 50px;
  transition: all 0.3s ease;
  border: solid 2px #0c314b;
}
a.dark-button:hover {
  background-color: transparent;
  color: #0c314b;
}