body {
  font-family: sans-serif;
  text-align: center;
  margin: 2em;
}
input {
  padding: 0.5em;
  margin: 0.5em;
}
iframe {
  margin: 1em 0;
}
#chatBox {
  border: 1px solid #aaa;
  width: 400px;
  margin: 1em auto;
  padding: 1em;
  height: 150px;
  overflow-y: scroll;
}