demo/custom.css

textarea {
  width: 100%;
  height: 400px;
  min-height: 400px;
  font-family: monospace;
  resize: vertical;
}

.two-fifths {
  width:40%;
}

.three-fifths {
  width:60%;
}

.container {
  width: 1200px;
}

.hidden {
  visibility: hidden;
}