Textarea Auto expand script.js

 if($('#long-answer-box').length){

            var textarea = document.querySelector('textarea');

            textarea.addEventListener('keydown', autosize);
            
            function autosize(){
                var el = this;
                setTimeout(function(){
                    el.style.cssText = 'height:auto; padding:0';
                    // for box-sizing other than "content-box" use:
                    // el.style.cssText = '-moz-box-sizing:content-box';
                    el.style.cssText = 'height:' + el.scrollHeight + 'px';
                },0);
            }
        }