body {
  font-family: Arial, sans-serif;
  margin: 0;
  background: #0f172a;
  color: #e2e8f0;
}

header {
  text-align: center;
  padding: 40px;
  background: #1e293b;
}

h1 {
  margin: 0;
}

main {
  padding: 20px;
}

section {
  margin-bottom: 20px;
}

footer {
  text-align: center;
  padding: 20px;
  background: #1e293b;
}