body {
  background-color: #111;
  color: #f2f2f2;
  font-family: Arial, sans-serif;
  text-align: center;
}
header {
  background-color: #1c1c1c;
  padding: 20px 0;
}
.logo {
  width: 120px;
}
nav a {
  color: #f2f2f2;
  margin: 0 15px;
  text-decoration: none;
}
nav a.active, nav a:hover {
  color: #ffb400;
}
footer {
  background-color: #1c1c1c;
  padding: 15px;
  margin-top: 30px;
}
.qr-section img {
  width: 150px;
  margin: 10px;
}