JSFiddle - React, Tailwind, and code Playground

HTML

<textarea placeholder=" Digite aqui" id="teste" class="form-control"></textarea>
<input type="submit" value="Enviar" class="enviar" />

CSS

.enviar {
  display:block;
  width: 70px;
}

JavaScript

$(document).ready(function(){
  $( "#teste" ).keypress(function() {
   if(event.keyCode == 13){
     $( "#myform" ).submit();
   }
  });
});