body {
  font-family: Arial, sans-serif;
  background: #f7f7f7;
  color: #333;
  margin: 0;
  padding: 0;
}
header, footer {
  background: #fff;
  padding: 1em;
  border-bottom: 1px solid #ccc;
}
h1 { margin: 0; }
main { padding: 1em; }
a { color: #0066cc; text-decoration: none; }
a:hover { text-decoration: underline; }