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  <div id="content" maxlength="2200" contenteditable></div>
	<p class="texto-cont">Restam <span id="count"></span> caracteres</p>


                #content {
  border: 1px solid #000;
  height: 150px;
  width: 400px


 * Captura os elementos
const content = document.querySelector("#content")
const count = document.querySelector("#count")

 * Utiliza o evento "input" para detectar novas alterações no textarea
content.addEventListener("input", () => {

   * Captura o valor do atributo "maxlength" e 
   * calcula a quantidade restantes de caracteres
  let maxLength = parseInt(content.getAttribute('maxlength'))
  let charRemaining = maxLength - content.textContent.length
  /* Converte o valor para pt-BR (Adiciona o "." em caso de milhar) */
  count.textContent = charRemaining.toLocaleString()
   * Utiliza uma operação ternária para verificar a quantidade de caracteres restantes
   * Se a qnt. restante for maior que 2190 => Verde, caso contrário realiza outra opção ternária
   * Se a qnt. restante for maior que 2180 e menor que 2190 => Laranja, caso contrário utiliza o vermelho
   */ = charRemaining > 2190 ? 'green' : charRemaining > 2180 ? 'orange' : 'red' = charRemaining > 2190 ? '#00800026' : charRemaining > 2180 ? '#ffa50026' : '#ff000026'

content.dispatchEvent(new Event("input"))