@keyframes crtAnimation {
  0% {
    background-position: 0 0;
  }

  100% {
    background-position: 0 10000%;
  }
}

.scanlines {
  box-shadow: inset 0px 0px 2rem;
  background-image: linear-gradient(0deg, #0000 10%, #fff1 90%, #0000 100%);
  animation: crtAnimation 100s linear infinite;
  background-size: 100% 80%;
}

div.retro-container {
    mask-image: linear-gradient(to bottom, #0005 50%, #000 50%);
    mask-size: 100% 2px;
}