JSFiddle - React, Tailwind, and code Playground

HTML

<script src="//maps.googleapis.com/maps/api/js?version=3.exp"></script>
<div id="map" style="width: 600px; height: 500px"></div>

CSS

.infoWindow {
width: 100px;
    overflow: auto;
        
}
.gm-style-iw > div { overflow: auto !important; }
.gm-style-iw { overflow: hidden !important; }

JavaScript

// Create map
map = new google.maps.Map(document.getElementById('map'), {
    zoom: 4,
    center: new google.maps.LatLng(-30, 145.5),
    mapTypeId: google.maps.MapTypeId.ROADMAP
});

// Create marker
var marker = new google.maps.Marker({
    position: new google.maps.LatLng(-37.8181, 145.119),
    map: map
});

// Create InfoWindow
var infoWindow = new google.maps.InfoWindow({
    content: '<div class="infoWindow">Aaa bbb ccc ddd Aaa bbb ccc ddd Aaa bbb ccc ddd Aaa bbb ccc ddd Aaa bbb ccc ddd Aaa bbb ccc ddd Aaa bbb ccc ddd Aaa bbb ccc ddd Aaa bbb ccc ddd Aaa bbb ccc ddd Aaa bbb ccc ddd Aaa bbb ccc ddd Aaa bbb ccc ddd Aaa bbb ccc ddd bbb ccAab ccc ddd Aaa bbb ccc ddd Aaa bbb ccc ddd Aaa bbb ccc ddd Aaa bbb ccc ddd Aaa bbb ccc ddd Aaa bbb ccc ddd Aaa bbb ccc ddd Aaa bbb ccc ddd Aaa bbb ccc ddd Aaa bbb ccc ddd Aaa bbb ccc ddd Aaa bbb ccc ddd </div>'
});

// Open window immediately
infoWindow.open(map, marker);

// Open again on marker click
google.maps.event.addListener(marker, 'click', function(){
    infoWindow.open(map, marker);
});