body {
  font-family: Georgia, serif;
  max-width: 800px;
  margin: 40px auto;
  padding: 0 20px;
  background-color: #f9f9f9;
  color: #222;
}

h1 {
  color: #1a1a2e;
}

h2 {
  color: #16213e;
  border-bottom: 2px solid #ccc;
  padding-bottom: 4px;
}

img {
  max-width: 100%;
  display: block;
  margin: 12px 0;
}

a {
  color: #0077cc;
}

.description {
  background-color: #eef4fb;
  padding: 12px 16px;
  border-left: 4px solid #0077cc;
  border-radius: 4px;
}

.diagram {
  border: 1px solid #ccc;
  border-radius: 6px;
}

#page-title {
  font-size: 2.2rem;
  margin-bottom: 8px;
}