body {
  font-family: Arial, sans-serif;
  margin: 20px;
  background-color: #f4f4f9;
  color: #333;
}

.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 20px;
  background: white;
  border-radius: 8px;
  box-shadow: 0 4px 8px rgba(0, 0, 0, 0.1);
}

.hidden {
  display: none;
}

#controls {
  margin: 20px 0;
}

#controls div {
  margin: 10px 0;
}

#variableSelection {
  margin: 20px 0;
}

#variableCheckboxes {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

canvas {
  margin-top: 20px;
  max-height: 600px;
}