body {
  font-family: 'Verdana', sans-serif;
  background-color: #000000f8;
  --grid-size: 50px; 
  background-image:
    linear-gradient(transparent calc(100% - 1px), #7e2748 1px),
    linear-gradient(90deg, transparent calc(100% - 1px), #7e2748 1px);
  background-size: var(--grid-size) var(--grid-size);
  background-repeat: repeat;
  padding: 0;
  margin: 0;
  animation: moveGrid 6s linear infinite;
}

@keyframes moveGrid {
  from { background-position: 0 0; }
  to   { background-position: calc(var(--grid-size) * -1) 0; }
}