@keyframes loading {
  0% {
    background-position: 0% 0;
  }
  100% {
    background-position: 100% 0;
  }
}

.loading-bar {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 0.25rem;
  background: linear-gradient(90deg, #007bff, #00ff7f, #007bff);
  background-size: 200% 100%;
  animation: loading 2s infinite;
  z-index: 1000;
  opacity: 0;
}