body {
  font-family: system-ui, sans-serif;
  max-width: 640px;
  margin: 2rem auto;
  padding: 0 1rem;
  line-height: 1.6;
  color: #222;
  background: #cccaca;
}

h1 {
  margin-bottom: 0.25rem;
}

a {
  color: #2563eb;
}

footer {
  margin-top: 3rem;
  font-size: 0.9rem;
  color: #666;
}

.topnav {
  background-color: #333;
  overflow: hidden;
}

.topnav a {
  float: left;
  display: block;
  color: #f2f2f2;
  text-align: center;
  padding: 14px 16px;
  text-decoration: none;
}

.topnav a:hover {
  background-color: #ddd;
  color: black;
}

.topnav a.active {
  background-color: #04AA6D;
  color: white;
}