.upload-spin {
  position: relative;
  width: 4rem;
  overflow: hidden;
}

.upload-spin>.veil {
  position: absolute;
  left: 0;
  bottom: 0;
  width: 100%;
  height: 40%;
  animation: fadeUp 2s linear infinite;
  z-index: 10;
  background-color: white;
}

@keyframes fadeUp {
  0% {
    opacity: .5;
    bottom: 0;
  }
  100% {
    opacity: 1;
    bottom: 100%;
  }
}