*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html, body {
  height: 100%;
}

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

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