.glow-line {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 4px;
  background-color: #ffffff;
  box-shadow: 0 0 10px #ffffff, 0 0 20px #ff0000, 0 0 30px #ff0000;
  z-index: 9999;
  animation: pulseGlow 10s infinite ease-in-out;
}

@keyframes pulseGlow {
  0%, 100% {
    opacity: 0.2;
  }
  50% {
    opacity: 1;
  }
}