<div id="CodeMirror cm-s-default"><textarea id="code"></textarea>
</div>
<!-- Create a simple CodeMirror instance -->
<link rel="stylesheet" href="https://codemirror.net/lib/codemirror.css">
<script src="https://codemirror.net/lib/codemirror.js"></script>
<script>
var editor = CodeMirror.fromTextArea(document.getElementById('code'), {
lineNumbers: true
});
</script>