body {
  font-family: Arial, sans-serif;
  background: #f4f4f4;
  color: #111;
  margin: 0;
}

header {
  background: #ffffff;
  border-bottom: 1px solid #ccc;
  padding: 10px;
}

nav a {
  margin-right: 10px;
  text-decoration: none;
  color: #0066cc;
}

section {
  padding: 20px;
}

.card {
  background: #fff;
  border: 1px solid #ddd;
  padding: 10px;
  margin-bottom: 15px;
}

img {
  max-width: 100%;
}