#trail-container {
  position: fixed;
  top: 0;
  left: 0;
  width: 100vw;
  height: 100vh;
  z-index: 80;
  pointer-events: none;
  overflow: hidden;
}

.trail-line {
  animation: fadeOut 0.3s forwards;
}

@keyframes fadeOut {
  from { opacity: 1; }
  to   { opacity: 0; }
}