* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  display: grid;
  grid-template-rows: auto 1fr auto;
  background: #111;
  color: white;
  font-family: sans-serif;
}

nav {
  display: flex;
  justify-content: space-between;
  padding: 1rem;
}

main {
  display: grid;
  place-items: center;
  padding: 2rem;
}