html, body {
  margin: 0;
  padding: 0;
}

body {
  text-align: center;
  background: #000;
  display: flex;
  align-items: center;
  justify-content: center;
  height: 100vh;
}

img {
  max-width: 100%;
  max-height: 90vh;
  display: block;
}