body {
  margin: 0;
  font-family: 'Arial', sans-serif;
  background-color: #121212;
  color: #fff;
}
header {
  background-color: #1f1f1f;
  padding: 20px;
  display: flex;
  justify-content: space-between;
  align-items: center;
}
header h1 {
  margin: 0;
}
nav a {
  color: #00ffcc;
  margin-left: 20px;
  text-decoration: none;
}
section {
  padding: 50px 20px;
}
h2 {
  color: #00ffcc;
}