body {
  font-family: Arial, sans-serif;
  background: #f0f0f0;
  color: #333;
  text-align: center;
  padding: 20px;
}
h1 {
  margin-bottom: 20px;
}
input, button {
  margin: 10px;
  padding: 10px;
  font-size: 16px;
}
.btn {
  background-color: #00aaff;
  color: #fff;
  border: none;
  cursor: pointer;
  border-radius: 5px;
}
canvas {
  margin-top: 20px;
  border: 1px solid #ccc;
  max-width: 100%;
  height: auto;
}