body {
  font-family: Arial, sans-serif;
  background-color: #f7f7f7;
  text-align: center;
  padding: 2em;
}
input {
  padding: 0.5em;
  margin: 0.5em;
}
button {
  padding: 0.5em 1em;
}
pre {
  white-space: pre-wrap;
  margin-top: 1em;
  text-align: left;
  max-width: 600px;
  margin-inline: auto;
}