body {
  font-family: Arial, sans-serif;
  margin: 0;
  padding: 0;
  background: #f4f4f4;
  color: #333;
}
header, section, footer {
  padding: 20px;
  max-width: 900px;
  margin: auto;
}
.btn-primary, .btn-secondary, .btn-download, .btn-pay {
  display: inline-block;
  padding: 10px 20px;
  margin-top: 10px;
  text-decoration: none;
  color: white;
  background-color: #007BFF;
  border-radius: 5px;
}
.btn-secondary {
  background-color: #6c757d;
}
.logo-billetos {
  width: 60px;
  height: auto;
  display: block;
  margin: 0 auto 10px auto;
}