.progress {
  background-color: #ffffff;
  width: 220px;
  height: 20px;
  overflow: hidden;
  backface-visibility: hidden;
  transform: skew(150deg);
}

.inner {
  background-image: linear-gradient(to right bottom, #1d2671, #4b2776, #6d2677, #8c2674, #a62a6f, #a73071, #a93572, #aa3a74, #943e7b, #7c417e, #65437c, #4e4376);
  height: 100%;
  transform-origin: left;
  transform: skew(-150deg);
  animation: progress 1.8s infinite;
}

@keyframes progress {
  0% {
    transform: scaleX(10%) translateX(-10%);
  }

  100% {
    transform: scaleX(90%) translateX(150%);
  }
}