div.numberedtextarea-wrapper { position: relative; }

div.numberedtextarea-wrapper textarea {
  display: block;
  -webkit-box-sizing: border-box;
  -moz-box-sizing: border-box;
  box-sizing: border-box;
}

div.numberedtextarea-line-numbers {
	position: absolute;
	top: 0;
	left: 0;
	right: 0;
	bottom: 0;
	width: 50px;
	border-right: 1px solid #ddd;
	color: #bbb;
	overflow: hidden;
}

div.numberedtextarea-number {
  padding-right: 6px;
  text-align: right;
}