JSFiddle - React, Tailwind, and code Playground

HTML

<input class="input1" type="text"/>

JavaScript

$( function(){//Gestion agrandissement input
	$('body').on('keyup','.input1', function(){
		$this=$(this);
 
	$this.css({width:$this.val().length*10 +"px"});
 
	});
  })