body {
  font-family: Arial, sans-serif;
  padding: 20px;
}

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

#formula, #code, #inputs {
  margin-top: 15px;
  padding: 10px;
  border: 1px solid #ccc;
  background: #f9f9f9;
}

canvas {
  margin-top: 20px;
  border: 1px solid #000;
}