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

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

body {
  background: #fff;
}

main {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 100%;
  padding: 2rem;
}

main a {
  display: block;
  line-height: 0;
}

main img {
  display: block;
  width: min(240px, 70vw);
  height: auto;
}