JSFiddle - React, Tailwind, and code Playground

by María Fernández

HTML

<div class="flex-container">
    <div class="flex-item flex1">header</div>
  <div class="flex-item flex2">2</div>
  <div class="flex-item flex3">
      <textarea id="ta"></textarea>
  </div>
</div>

CSS

.flex-container {
  padding: 0;
  margin: 0;
  height: 100vh;
  position: fixed;
  
  -ms-box-orient: vertical;
  display: -webkit-box;
  display: -moz-box;
  display: -ms-flexbox;
  display: -moz-flex;
  display: -webkit-flex;
  display: flex;
  flex-direction: column;
}

.flex-item {
  background: tomato;
  padding: 10px;
  border: 5px solid red; 
  
  color: white;
  font-weight: bold;
  font-size: 2em;
  text-align: center;
  padding-bottom: 0;
  border-top: none;
    textarea {
       background: white;
       width: 100%;
       height: auto;
       max-height: 120px;
       min-height: 60px;
    }
}
.flex1 { flex: content; }
.flex2 { flex: auto; overflow-y: auto; }
.flex3 { flex: content; }

JavaScript

// Autosize code (after it, apply autosize to textarea):
/*!
	Autosize 3.0.13
	license: MIT
	http://www.jacklmoore.com/autosize
*/
(function (global, factory) {
	if (typeof define === 'function' && define.amd) {
		define(['exports', 'module'], factory);
	} else if (typeof exports !== 'undefined' && typeof module !== 'undefined') {
		factory(exports, module);
	} else {
		var mod = {
			exports: {}
		};
		factory(mod.exports, mod);
		global.autosize = mod.exports;
	}
})(this, function (exports, module) {
	'use strict';

	var set = typeof Set === 'function' ? new Set() : (function () {
		var list = [];

		return {
			has: function has(key) {
				return Boolean(list.indexOf(key) > -1);
			},
			add: function add(key) {
				list.push(key);
			},
			'delete': function _delete(key) {
				list.splice(list.indexOf(key), 1);
			} };
	})();

	function assign(ta) {
		var _ref = arguments[1] === undefined ? {} : arguments[1];

		var _ref$setOverflowX = _ref.setOverflowX;
		var setOverflowX = _ref$setOverflowX === undefined ? true : _ref$setOverflowX;
		var _ref$setOverflowY = _ref.setOverflowY;
		var setOverflowY = _ref$setOverflowY === undefined ? true : _ref$setOverflowY;

		if (!ta || !ta.nodeName || ta.nodeName !== 'TEXTAREA' || set.has(ta)) return;

		var heightOffset = null;
		var overflowY = null;
		var clientWidth = ta.clientWidth;

		function init() {
			var style = window.getComputedStyle(ta, null);

			overflowY = style.overflowY;

			if (style.resize === 'vertical') {
				ta.style.resize = 'none';
			} else if (style.resize === 'both') {
				ta.style.resize = 'horizontal';
			}

			if (style.boxSizing === 'content-box') {
				heightOffset = -(parseFloat(style.paddingTop) + parseFloat(style.paddingBottom));
			} else {
				heightOffset = parseFloat(style.borderTopWidth) + parseFloat(style.borderBottomWidth);
			}
			// Fix when a textarea is not on document body and heightOffset is Not a Number
			if (isNaN(heightOffset)) {
				heightOffset =...