body {
  font-family: sans-serif;
  background-color: #f8f9fa;
  margin: 0;
  color: #333;
}
header {
  background-color: #007bff;
  color: white;
  padding: 20px;
  text-align: center;
}
nav a {
  margin: 0 10px;
  color: white;
  text-decoration: none;
}
main {
  padding: 20px;
}
footer {
  background-color: #f1f1f1;
  text-align: center;
  padding: 15px;
  margin-top: 20px;
}