@media (prefers-color-scheme: dark) {
  body {
    background-color: #000;
    color: #888;
  }

  textarea {
    background-color: #333;
    color: #fff;
  }
}

@media (prefers-color-scheme: light) {
  body {
    background-color: #888;
    color: #333;
  }

  textarea {
    background-color: #bbb;
    color: #333;
  }
}

body {
  font-family: sans-serif;
  display: flex;
  justify-content: center;
  text-align: center;
}

div#problem {
  white-space: pre-wrap;
  text-align: right;
  display: flex;
  justify-content: center;
  text-align: right;
}

input[type="radio"] {
  margin-top: -1px;
  vertical-align: middle;
  margin-right: 10px;
}