Shimmer Progress Bar

<div class="prog"><div class="prog-fill"></div></div>

.prog {
  width: 280px;
  height: 8px;
  background: rgba(255,255,255,0.08);
  border-radius: 9999px;
  overflow: hidden;
  position: relative;
}
.prog-fill {
  width: 65%;
  height: 100%;
  background: linear-gradient(90deg, #7c3aed, #ec4899);
  border-radius: 9999px;
  position: relative;
  overflow: hidden;
}
.prog-fill::after {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(90deg, transparent, rgba(255,255,255,0.5), transparent);
  animation: prog-shimmer 1.8s linear infinite;
}
@keyframes prog-shimmer {
  from { transform: translateX(-100%); }
  to { transform: translateX(100%); }
}