body {
  background: #f4f6f9;
}
.card {
  border: none;
  box-shadow: 0 1px 3px rgba(0,0,0,0.08);
}
.option-label {
  display: block;
  padding: 10px 14px;
  border: 1px solid #dee2e6;
  border-radius: 6px;
  margin-bottom: 8px;
  cursor: pointer;
}
.option-label:hover {
  background: #f1f3f5;
}
.option-correct {
  background: #e6f4ea;
  border-color: #86c992;
}
.option-wrong {
  background: #fbe9e7;
  border-color: #e79a90;
}