body {
  font-family: Arial, sans-serif;
  margin: 0;
  background-color: #111;
  color: #eee;
  line-height: 1.6;
}

header {
  background-color: #222;
  padding: 2rem;
  text-align: center;
  border-bottom: 3px solid #444;
}

nav {
  background-color: #000;
  text-align: center;
  padding: 1rem 0;
}

nav a {
  margin: 0 1rem;
  color: #fff;
  text-decoration: none;
  font-weight: bold;
}

nav a:hover {
  text-decoration: underline;
}

main {
  padding: 2rem;
}

.hero-image {
  width: 100%;
  height: auto;
  display: block;
  margin-bottom: 2rem;
  border-bottom: 3px solid #333;
}

#quiz-container button {
  padding: 0.6rem 1.2rem;
  margin-right: 1rem;
  font-size: 1rem;
  background-color: #444;
  color: white;
  border: none;
  border-radius: 5px;
  cursor: pointer;
}

#quiz-container button:hover {
  background-color: #666;
}

#feedback {
  margin-top: 1rem;
  font-weight: bold;
}

footer {
  background-color: #222;
  text-align: center;
  padding: 1rem;
  font-size: 0.9rem;
  border-top: 3px solid #444;
}

.hero-image {
  width: 100%;
  max-width: 800px; /* limits the image width */
  height: auto;
  display: block;
  margin: 0 auto 2rem auto; /* centers the image and adds bottom margin */
  border-bottom: 3px solid #333;
}

.logo {
  max-width: 180px;
  height: auto;
  display: block;
  margin: 0 auto 1rem auto;
}