body {
  font-family: Arial, sans-serif;
  max-width: 980px;
  margin: 0 auto;
  line-height: 1.6;
}

.site-header, footer {
  background: #f2f2f2;
  padding: 16px;
  margin: 16px 0;
}

nav a {
  margin-right: 12px;
}

.sidebar {
  float: right;
  width: 260px;
  background: #fafafa;
  border: 1px solid #ddd;
  padding: 12px;
  margin-left: 20px;
}

main {
  margin-right: 300px;
}

article {
  padding: 12px;
}