body {
  font-family: Arial, sans-serif;
  background-color: #f9f9f9;
  margin: 0;
  padding: 0;
  color: #333;
}
header {
  background-color: #e3e3e3;
  padding: 2em;
  text-align: center;
}
main {
  padding: 2em;
}
section {
  margin-bottom: 2em;
}
footer {
  background-color: #222;
  color: #fff;
  text-align: center;
  padding: 1em;
}