body {
  font-family: 'Arial', sans-serif;
  background-color: #f9f9f9;
  margin: 0;
  padding: 0;
  text-align: center;
}

.container {
  margin-top: 30px;
  padding: 20px;
}

.cover {
  width: 300px;
  border-radius: 16px;
  box-shadow: 0 4px 10px rgba(0, 0, 0, 0.2);
  margin-bottom: 20px;
}

h1 {
  font-size: 2.5em;
  margin-bottom: 10px;
}

.subtitle {
  font-size: 1.2em;
  color: #555;
  margin-bottom: 20px;
}

.description {
  font-size: 1em;
  color: #333;
  margin-bottom: 30px;
  line-height: 1.6;
}

.buttons a {
  display: inline-block;
  margin: 10px;
  padding: 12px 25px;
  background-color: #FF7F50;
  color: white;
  text-decoration: none;
  border-radius: 10px;
  font-size: 1em;
  transition: 0.3s ease;
}

.buttons a:hover {
  background-color: #FF4500;
  transform: scale(1.05);
  box-shadow: 0 4px 8px rgba(0,0,0,0.2);
}

.author {
  margin-top: 40px;
  font-size: 0.9em;
  color: #888;
}

iframe {
  border: none;
  margin-top: 20px;
}