* {
  box-sizing: border-box;
}

html,
body {
  min-height: 100%;
}

body {
  margin: 0;
  background: #333;
}

main {
  min-height: 100svh;
  display: grid;
  place-items: center;
}

.logo {
  display: block;
  width: min(82vw, 82svh, 640px);
  height: auto;
}