.hero {
  min-height: 60vh;
  background: linear-gradient(rgba(0, 60, 90, 0.55), rgba(0, 60, 90, 0.55)),
    url("https://images.unsplash.com/photo-1544551763-46a013bb70d5?auto=format&fit=crop&w=1600&q=60")
    center / cover no-repeat;
}

.card-title {
  color: #0d6e4f;
}

footer a {
  color: inherit;
}