JSFiddle - React, Tailwind, and code Playground

HTML

<script src="https://code.jquery.com/jquery-3.1.1.min.js"></script>
<div class="alert alert-success" style="display: none;">Успешно</div>

CSS

.alert-success {
  background:green;
  margin:20px auto;
  padding:20px;
  color:#fff;
  width:200px;
}

JavaScript

$(document).ready(function() {

  var alertSuccess = $('.alert-success');

  alertSuccess.css('display','block');
  setTimeout(function() {
    alertSuccess.hide();
  }, 5000);   

});