body {
  margin: 0;
  font-family: system-ui, sans-serif;
  background: #f4f6f8;
}

header {
  background: #111;
  color: #fff;
  padding: 16px 32px;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

nav a {
  color: #fff;
  margin-left: 16px;
  text-decoration: none;
}

main {
  padding: 40px;
}

footer {
  text-align: center;
  padding: 20px;
  color: #666;
}