.div-block-15 a:nth-child(1) .home-explore-card-overlay {
  background-color: #0076bb;
}
.div-block-15 a:nth-child(2) .home-explore-card-overlay {
  background-color: #00a0dd;
}
.div-block-15 a:nth-child(3) .home-explore-card-overlay {
  background-color: #004e7d;
}
.div-block-15 a:nth-child(4) .home-explore-card-overlay {
  background-color: #0076bb;
}