body {
  font-family: Arial, sans-serif;
  background: #f0f4f8;
  display: flex;
  justify-content: center;
  align-items: center;
  height: 100vh;
}

.quiz-container {
  background: white;
  border-radius: 10px;
  padding: 20px;
  width: 400px;
  box-shadow: 0 0 10px rgba(0,0,0,0.1);
  text-align: center;
}

.btn-grid {
  display: flex;
  flex-direction: column;
  margin-top: 10px;
}

button {
  margin: 5px 0;
  padding: 10px;
  border: none;
  background: #3498db;
  color: white;
  border-radius: 5px;
  cursor: pointer;
}

button:hover {
  background: #2980b9;
}

#next-btn {
  margin-top: 20px;
  display: none;
}

.hide {
  display: none;
}