body {
  font-family: Arial, sans-serif;
  line-height: 1.6;
  margin: 0;
  padding: 0;
  background-color: #f4f4f4;
}

header, footer {
  background-color: #222;
  color: #fff;
  padding: 1em 2em;
}

header h1 {
  margin: 0;
}

nav a {
  color: #fff;
  margin-right: 1em;
  text-decoration: none;
}

nav a:hover {
  text-decoration: underline;
}

main {
  padding: 2em;
}

article {
  background-color: #fff;
  padding: 1em 2em;
  margin-bottom: 1em;
  border-radius: 5px;
  box-shadow: 0 0 5px rgba(0,0,0,0.1);
}