body {
  margin: 0;
  padding: 0;
  font-family: sans-serif;
  background-color: #f9f9f9;
  overflow: hidden;
  position: relative;
  color: #111;
}

.background-animation {
  position: fixed;
  top: 0;
  left: 0;
  width: 200%;
  height: 200%;
  background-image: repeating-linear-gradient(
    45deg,
    rgba(0, 0, 0, 0.03) 0,
    rgba(0, 0, 0, 0.03) 2px,
    transparent 2px,
    transparent 20px
  );
  z-index: -1;
  animation: moveBackground 30s linear infinite;
}

@keyframes moveBackground {
  0% {
    background-position: 0 0;
  }
  100% {
    background-position: 200px 0;
  }
}