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

header {
  text-align: center;
  padding: 60px 20px;
  background: #020617;
}

h1 {
  margin: 0;
  font-size: 2.5em;
}

section {
  padding: 40px 20px;
  max-width: 800px;
  margin: auto;
}

.card {
  background: #020617;
  padding: 20px;
  margin-top: 15px;
  border-radius: 10px;
}

footer {
  text-align: center;
  padding: 20px;
  background: #020617;
}