body {
  font-family: Arial, sans-serif;
  margin: 0;
  padding: 0;
  background: #f5f7fa;
  color: #333;
}
header, footer {
  background-color: #2b2d42;
  color: white;
  padding: 1rem;
  text-align: center;
}
main {
  padding: 2rem;
}