#editor {
  min-height: 10em;
  background: #eee;
  font-family: monospace;
  white-space: pre;
}

#editor > div {
  min-height: 1em;
  line-height: 1em;
}

#editor > div > .cursor {
  animation: cursor 1200ms steps(1, end) infinite;
}

@keyframes cursor {
  from, to {
    background: #000;
    color: #fff;
  }
  50% {
    background: none;
    color: #000;
  }
}