/* Bài 1 */
body {
  font-family: Arial, sans-serif;
  line-height: 1.65;
  color: #203047;
  max-width: 68rem;
  margin: 0 auto;
  padding: 1rem;
}

/* Bài 2 */
.intro { font-size: 1.125rem; color: #425a73; }
.card h3 { color: #173957; }
.card a { text-decoration-thickness: 0.12em; }
.site-nav > a { color: #125a82; }