JSFiddle - React, Tailwind, and code Playground

HTML

<!DOCTYPE html>
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
    <meta http-equiv="Content-Type" content="text/html; charset=utf-8">
    <meta http-equiv="X-UA-Compatible" content="IE=7,IE=9" />
    <meta name="viewport" content="initial-scale=1, maximum-scale=1,user-scalable=no" />
    <title>Splash</title>

    <link rel="stylesheet" href="http://serverapi.arcgisonline.com/jsapi/arcgis/3.5/js/dojo/dijit/themes/claro/claro.css">
    <link rel="stylesheet" href="http://serverapi.arcgisonline.com/jsapi/arcgis/3.5/js/esri/css/esri.css">
    <link rel="stylesheet" type="text/css" href="css/style.css" />
    <link href="css/dgrid.css" rel="stylesheet" />
    <link href="css/grid.css" rel="stylesheet" />

    <script src="http://coastalscience.noaa.gov/_assets/scripts/federated-analytics.js"></script>

    <script>
        var dojoConfig = {
            parseOnLoad: true,
            packages: [{
                "name": "agsjs",
                "location": location.pathname.replace(/\/[^/]+$/, "") + '/agsjs'
                //"location": 'http://gmaps-utility-gis.googlecode.com/svn/tags/agsjs/2.04/xbuild/agsjs' // for xdomain load
            }]
     
        };
    </script>

    <script src="http://serverapi.arcgisonline.com/jsapi/arcgis/3.5/"></script>


    <script>
        var map;
        require(["esri/map", "dojo/domReady!"], function (Map) {
            map = new Map("mapDiv", {
                center: [-56.049, 38.485],
                zoom: 3,
                basemap: "streets"
            });
            //dijit.byId("dialogWelcome").show();
        });
    </script>

    <style>
        html, body
        {
            height: 100%;
            width: 100%;
            margin: 0;
            padding: 0px;
            font-family: helvetica, arial, sans-serif;
            font-size: 90%;
        }

        #mapDiv
        {
            margin: 0px;
            border: solid 1px #B5BCC7;
            height: 100%;
            width: 100%;

        }

 ...

JavaScript

function init() {
dialogWelcome.show();
}
dojo.addOnLoad(init);