@keyframes bg-anim {
  0% {
    background-position: 0 0;
  }
  50% {
    background-position: 12px 12px;
  }
  100% {
    background-position: 24px 24px;
  }
}

.bg-grid {
  background-image: linear-gradient(to right, #80808012 1px, transparent 1px),
    linear-gradient(to bottom, #80808012 1px, transparent 1px);
  background-size: 24px 24px;
  animation: bg-anim 1.5s linear infinite;
}