body {
  font-family: Arial;
  background: #f2f2f2;
  text-align: center;
}

.container {
  background: white;
  padding: 20px;
  margin: 40px auto;
  width: 600px;
  border-radius: 10px;
}

input {
  width: 70%;
  padding: 10px;
}

button {
  padding: 10px;
  cursor: pointer;
}

canvas {
  margin-top: 20px;
}