body {
  margin: 0;
  font-family: Arial, sans-serif;
  color: #1e293b;
  line-height: 1.6;
}

header {
  background: #0f766e;
  color: white;
  text-align: center;
  padding: 80px 20px;
}

header a {
  display: inline-block;
  background: white;
  color: #0f766e;
  padding: 12px 20px;
  border-radius: 6px;
  text-decoration: none;
}

main {
  max-width: 900px;
  margin: auto;
  padding: 30px 20px;
}