body {
  font-family: sans-serif;
  text-align: center;
  margin: 20px;
  padding: 0;
}

h1 {
  font-size: 1.8em;
  margin-bottom: 10px;
}

textarea {
  width: 90%;
  max-width: 500px;
  height: 150px;
  font-size: 1em;
  padding: 10px;
  box-sizing: border-box;
}

canvas {
  margin-top: 20px;
  max-width: 100%;
  height: auto;
}

#result {
  font-size: 1.5em;
  margin-top: 20px;
  color: green;
  word-break: break-word;
}

button {
  font-size: 1em;
  margin: 10px;
  padding: 10px 20px;
}

@media screen and (max-width: 600px) {
  h1 {
    font-size: 1.5em;
  }

  textarea {
    height: 120px;
    font-size: 0.9em;
  }

  canvas {
    width: 100%;
    height: auto;
  }

  button {
    width: 40%;
    margin: 5px;
  }
}