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

body {
  font-family: system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto,
    Oxygen, Ubuntu, Cantarell, 'Open Sans', 'Helvetica Neue', sans-serif;
  font-size: 1rem;
  line-height: 1.5;

  display: flex;
  justify-content: center;
  align-items: center;
  flex-direction: column;
  min-height: 100vh;
}

header {
  margin-bottom: 1rem;
}

nav a {
  font-size: 1.2rem;
  padding: 1rem;
  color: #111;
  text-decoration: underline;
}