textarea, pre {
  margin: 0;
  padding: 0;
  outline: 0;
  border: 0;
}

.expandingArea {
  position: relative;
}

.expandingArea > textarea, .expandingArea > pre {
  padding: 5px;
  background: transparent;
  font: 400 13px/16px helvetica, arial, sans-serif;
  white-space: pre-wrap;
  word-wrap: break-word;
}

.expandingArea > textarea {
  -webkit-box-sizing: border-box;
  -moz-box-sizing: border-box;
  -ms-box-sizing: border-box;
  box-sizing: border-box;
  width: 100%;
  height: 100px;
}

.expandingArea > pre {
  display: none;
}