.index-header .parallax {
  background-color: #3d5afe;
}

.index-thumbs:nth-child(4n+1) {
  background-color: #3d5afe;
}

.index-thumbs:nth-child(4n+2) {
  background-color: #00e676;
}

.index-thumbs:nth-child(4n+3) {
  background-color: #eeff41;
}

.index-thumbs:nth-child(4n+4) {
  background-color: #ff1744;
}