html,
body {
  width: 100%;
  height: 100%;
  margin: 0;
}

body {
  min-height: 100dvh;
  display: grid;
  place-items: center;
  background-color: #081221;
  overflow: hidden;
}

img {
  width: min(70vw, 1000px, 90dvh);
  height: auto;
  animation: pulse 4s ease-in-out infinite;
}

@keyframes pulse {
  0%,
  100% {
    opacity: 30%;
  }

  50% {
    opacity: 100%;
  }
}