/* custom.css */
  .scene__cloud-front {
  opacity: 0.4;
  animation: move-cloud-front 40s linear infinite;
}

.scene__cloud_n_1 {
  opacity: 0.3;
  animation: move-cloud-1 20s linear infinite;
}

.scene__cloud_n_2 {
  opacity: 0.2;
  animation: move-cloud-2 25s linear infinite;
}

.scene__cloud_n_3 {
  opacity: 0.2;
  animation: move-cloud-2 30s linear infinite;
}

.scene__cloud_n_4 {
  opacity: 0.4;
  animation: move-cloud-2 40s linear infinite;
}