.hero {
  background: linear-gradient(rgba(0,0,0,.6), rgba(0,0,0,.6)),
  url('https://images.unsplash.com/photo-1523580846011-d3a5bc25702b') center/cover;
}

.carousel-bg {
  height: 80vh;
  display: flex;
  align-items: center;
  justify-content: center;
  background-size: cover;
  background-position: center;
  position: relative;
}

.carousel-bg::before {
  content: "";
  position: absolute;
  inset: 0;
  background: rgba(0,0,0,.55);
}

.carousel-bg .container {
  position: relative;
  z-index: 2;
}

.bg1 {
  background-image: url("../assets/01.png");
}

.bg2 {
  background-image: url("../assets/02.png");
}

.bg3 {
  background-image: url("assets/01.png");
}