body {
  font-family: Arial, sans-serif;
  background-color: #f1f3f5;
  display: flex;
  justify-content: center;
  align-items: center;
  height: 100vh;
}

.quiz-container {
  background-color: #fff;
  padding: 30px 40px;
  border-radius: 10px;
  width: 450px;
  box-shadow: 0 4px 12px rgba(0,0,0,0.15);
  text-align: center;
}

h1 {
  margin-bottom: 20px;
  color: #333;
}

h2 {
  margin: 20px 0 10px;
}

ul {
  text-align: left;
  list-style-type: none;
  padding: 0;
}

li {
  margin: 12px 0;
}

label {
  margin-left: 8px;
}

button {
  margin-top: 20px;
  background-color: #007bff;
  color: white;
  padding: 10px 25px;
  border: none;
  border-radius: 5px;
  cursor: pointer;
}

button:hover {
  background-color: #0056b3;
}

#timer {
  margin-top: 15px;
  font-weight: bold;
  color: #e53935;
}

#score-info {
  margin-top: 10px;
  font-weight: bold;
  color: #00796b;
}

.progress-container {
  background-color: #ddd;
  height: 10px;
  width: 100%;
  border-radius: 5px;
  overflow: hidden;
  margin-bottom: 20px;
}

#progress-bar {
  height: 100%;
  width: 0%;
  background-color: #28a745;
  transition: width 0.3s ease-in-out;
}