HTTP/1.1 200 OK
Content-Type: text/css

/* Main CSS file for the website */
body {
  font-family: Arial, sans-serif;
  margin: 0;
  padding: 0;
  background-color: #f4f4f4;
}

header {
  background-color: #333;
  color: #fff;
  padding: 10px;
  text-align: center;
}