html,
body {
  box-sizing: border-box;
  height: 100dvh;
  margin: 0;
  background-color: hsl(0, 0%, 20%);
  color: white;
  text-align: center;
}

body {
  padding: 1rem;
}

a {
  color: aqua;
}

img {
  width: min(500px, 80%);
}