body {
  font-family: system-ui, sans-serif;
  margin: 0;
  padding: 0;
  line-height: 1.6;
  display: flex;
  flex-direction: column;
  min-height: 100dvh;
}

header {
  background: #222;
  color: #fff;
  padding: 1rem;
}

header h1 {
  margin: 0;
}

header nav a {
  color: #fff;
  margin-right: 1rem;
  text-decoration: none;
}

footer {
  background: #222;
  color: #fff;
  text-align: center;
  padding: 1rem;
}

main {
  padding: 2rem;
  flex: 1;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
}