JSFiddle - React, Tailwind, and code Playground

HTML

<div id="container">
    <div id="map_size" class="map_size">   
        <div id="msg">
            new records available.          
        </div>    
    </div>
</div>

CSS

body{
    margin:0px auto;
    width:80%;
    height:80%;
    font-family: Verdana,Geneva,sans-serif;
}

/*container for all divs inside*/
#container {
    width:1450px;   
}

/*map size*/
#map_size{
    width:1190px;
    height:1300px;
    background:#0099FF;
    border-style: solid;
    border-color: black;
    position: relative;
    float:left;
}

/*msg*/
.station_info_ {
    z-index: 100;
    position: absolute;
    background-color:white;
    border-radius: 5px;
    height: 200px;
    margin-left: 50px;
    width:  275px;
    border:4px solid black;
}

JavaScript

$('document').ready(function(){
    
    $('#msg').hide();
    
    window.setTimeout(
        function(){
            $('#msg').show();
            setInterval(function(){ $('#msg').toggle(); }, 100);
        }        
        ,3000);
});