body {
  font-family: Arial, sans-serif;
  margin: 0;
  padding: 20px;
  transition: 0.3s;
}

.light {
  background: #f5f5f5;
  color: #000;
}

.dark {
  background: #121212;
  color: #fff;
}

h1 {
  text-align: center;
}

.controls {
  text-align: center;
  margin-bottom: 20px;
}

button {
  padding: 10px;
  margin: 5px;
  cursor: pointer;
}

input, select {
  padding: 8px;
  margin: 5px;
}

.question {
  margin: 15px 0;
  padding: 10px;
  border-radius: 10px;
  background: #ddd;
}

.dark .question {
  background: #1e293b;
}