body {
  font-family: sans-serif;
  max-width: 480px;
  margin: 60px auto;
  padding: 0 16px;
}

h1 {
  margin-bottom: 24px;
}

label {
  display: block;
  margin-bottom: 4px;
  font-size: 14px;
}

input {
  display: block;
  width: 100%;
  padding: 8px;
  margin-bottom: 16px;
  font-size: 14px;
  border: 1px solid #ccc;
  border-radius: 4px;
  box-sizing: border-box;
}

button {
  padding: 8px 20px;
  font-size: 14px;
  cursor: pointer;
}

#result {
  margin-top: 24px;
  display: none;
}

#result pre {
  margin-top: 8px;
  white-space: pre-wrap;
  word-break: break-all;
  font-size: 13px;
}