Line 17 of the page you are linking to shows how the infowindow content is configured:
infowindow.setContent('<div><strong>' + place.name + '</strong><br>' + address);
You need to install an add-on for the inline (for example style="padding: 0px;"
) or CSS class (for example class="myInfoWindow"
), and then set the CSS properties in your head or a separate CSS file.
Thus, using the first, you change the line to:
infowindow.setContent('<div style="padding: 0px;"><strong>' + place.name + '</strong><br>' + address);
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