body {
  margin: 0;
  font-family: Arial, sans-serif;
  background: #0f172a;
  color: white;
  text-align: center;
}

header {
  padding: 30px;
  background: #020617;
}

section {
  padding: 40px 20px;
}

.btn {
  display: inline-block;
  margin: 10px;
  padding: 14px 22px;
  background: #38bdf8;
  color: #020617;
  font-weight: bold;
  border-radius: 8px;
  text-decoration: none;
}