body {
  font-family: Arial, sans-serif;
  margin: 0;
  padding: 0;
  background-color: #f2f2f2;
}

.container {
  max-width: 800px;
  margin: 20px auto;
  padding: 20px;
  background-color: #fff;
  border-radius: 10px;
  box-shadow: 0 0 10px rgba(0, 0, 0, 0.1);
}

h1 {
  text-align: center;
}

h2 {
  text-align: center; /* Centreren van de categorie-titels */
}

.question {
  margin-bottom: 20px;
}

.options label {
  display: block;
}

.options input[type="radio"] {
  margin-right: 5px;
}

.correct {
  background-color: #c8e6c9; /* Light green background */
  border: 2px solid #4caf50; /* Green border */
  border-radius: 5px; /* Rounded corners */
}

.incorrect {
  background-color: #ffcdd2; /* Light red background */
  border: 2px solid #f44336; /* Red border */
  border-radius: 5px; /* Rounded corners */
}