JSFiddle - React, Tailwind, and code Playground

HTML

<script src="https://cdnjs.cloudflare.com/ajax/libs/toastr.js/latest/toastr.min.js"></script>
<link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/toastr.js/latest/toastr.min.css">

JavaScript

toastr.options = {
    tapToDismiss: false
    , timeOut: 0
    , extendedTimeOut: 0
    , allowHtml: true
    , preventDuplicates: true
    , preventOpenDuplicates: true
    , newestOnTop: true
    , closeButton: true
    , closeHtml: '<button class="btn" style="background-color: grey; padding: 5px;">OK</button>'
}

toastr.warning("You are warned");
toastr.warning("You are warned 2");