body {
  font-family: Arial, sans-serif;
  margin: 20px;
}
#controls {
  margin-bottom: 20px;
}
.question-block {
  border: 1px solid #ccc;
  padding: 10px;
  margin-bottom: 15px;
  border-radius: 5px;
  background: #f9f9f9;
}
.question-block h3 {
  margin-top: 0;
}
.options div {
  margin: 4px 0;
}
button {
  margin-top: 8px;
  padding: 5px 10px;
}