body {
  font-family: Arial, Helvetica, sans-serif;
  margin: 0;
  background: #f2f2f2;
  color: #222;
}
header {
  background: #111;
  color: #fff;
  padding: 20px;
}
nav a {
  color: #fff;
  margin-right: 15px;
  text-decoration: none;
  font-weight: bold;
}
main {
  max-width: 1100px;
  margin: auto;
  background: #fff;
  padding: 40px;
}
article h2 {
  margin-top: 0;
}
article p {
  margin-bottom: 18px;
  line-height: 1.8;
}
footer {
  background: #000;
  color: #fff;
  padding: 25px;
  text-align: center;
  margin-top: 40px;
}
footer nav a {
  color: #ccc;
  text-decoration: none;
  margin: 0 5px;
}