Babylon.js/Viewer/assets/templates/default/defaultTemplate.html

<style>
    @font-face {
        font-family: 'babylon';
        src: url('{{babylonFont}}') format('woff');
        font-weight: normal;
        font-style: normal;
    }

    .icon {
        font-family: "babylon";
    }
</style>

{{#if fillScreen}}
<style>
    html,
    body {
        width: 100%;
        height: 100%;

        margin: 0;
        padding: 0;
    }
</style>
{{/if}}

<fill-container></fill-container>