body {
  background: linear-gradient(180deg, #05030a 0%, #0a0613 40%, #120a1a 100%) fixed;
  color: #fff;
}

/* animated stars */
body::before {
  content: "";
  position: fixed;
  inset: 0;
  background: transparent url("https://www.transparenttextures.com/patterns/stardust.png") repeat;
  animation: stars 120s linear infinite;
  opacity: 0.15;
  z-index: -1;
}

@keyframes stars {
  from { background-position: 0 0; }
  to   { background-position: -2000px 2000px; }
}