.centered {
  text-align: center;
  display: block;
}

.centered img {
  display: block;
  margin: 0 auto;
}

.book-footer {
  margin-top: 4rem;
  padding: 2rem 0;
  border-top: 1px solid #e2e8f0;
  text-align: center;
  font-size: 0.875rem;
  color: #718096;
  font-family: 'Source Sans 3', sans-serif;
}

.book-footer p {
  margin: 0.5rem 0;
  line-height: 1.6;
}

.book-footer a {
  color: #3182ce;
  text-decoration: none;
  margin: 0 0.5rem;
}

.book-footer a:hover {
  text-decoration: underline;
  color: #2c5282;
}

/* Push footer to bottom on short pages */
body {
  display: flex;
  flex-direction: column;
  min-height: 100vh;
}

.quarto-content {
  flex: 1;
}