JSFiddle - React, Tailwind, and code Playground

HTML

<div class ="message_after_login">Testing for first message</div>
        <div class = "message_after_login">This is for testing 2nd message</div>

CSS

#message_after_login {display: none;}

JavaScript

(function() {

            var message = jQuery(".message_after_login");
            var message_index = -1;

            function shownextmessage() {
                ++message_index;
                message.eq(message_index % message.length)
                        .fadeIn(2000)
                        .delay(2000)
                        .fadeOut(2000, shownextmessage);
            }

            shownextmessage();

        })();