body {
  font-family: 'Segoe UI', Tahoma, sans-serif;
  margin: 0;
  background-color: #f9f9f9;
  color: #222;
}
header {
  background-color: #232f3e;
  color: white;
  padding: 20px;
  text-align: center;
}
h1, h2 {
  margin: 0;
}
section {
  padding: 20px;
}
a {
  color: #007acc;
}