body {
  font-family: Arial, sans-serif;
  background: #f2f2f2;
  padding: 20px;
}

h2 {
  margin-bottom: 10px;
}

label, select, button {
  font-size: 16px;
  margin-top: 10px;
  display: block;
}

select {
  padding: 5px;
  margin-bottom: 10px;
}

#runBtn {
  padding: 10px 20px;
  margin: 10px 0;
  background-color: #007bff;
  color: white;
  border: none;
  cursor: pointer;
  border-radius: 4px;
}

#runBtn:hover {
  background-color: #0056b3;
}

pre {
  background-color: #222;
  color: #0f0;
  padding: 15px;
  min-height: 150px;
  white-space: pre-wrap;
  overflow-x: auto;
  font-size: 14px;
  border-radius: 5px;
}