body {
  font-family: Arial, sans-serif;
  background: #fff;
  color: #333;
  margin: 0;
  padding: 0;
}
header {
  background: #990000;
  color: white;
  padding: 1em;
  text-align: center;
}
main {
  padding: 2em;
  max-width: 800px;
  margin: auto;
}