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

<style>
    nav-bar {
        position: absolute;
        height: 160px;
        width: 100%;
        bottom: 0;
        background-color: rgba(0, 0, 0, 0.3);
        color: white;
        transition: 1s;
        align-items: flex-start;
        justify-content: space-around;
        display: flex;

        flex-direction: column;
    }

    /* Big screens have room for the entire navbar */

    @media screen and (min-width: 768px) {
        nav-bar {
            align-items: center;
            flex-direction: row;
            justify-content: space-between;
            height: 80px;
        }
    }

    div.flex-container {
        display: flex;
        width: 100%;
    }

    div.thumbnail {
        position: relative;
        overflow: hidden;
        display: block;
        width: 40px;
        height: 40px;
        background-size: cover;
        background-position: center;
        border-radius: 20px;
        margin: 0 10px;
    }

    div.title-container {
        flex-direction: column;
        display: flex;
        justify-content: space-between;
    }

    span.model-title {
        font-size: 125%;
    }

    span.model-subtitle {
        font-size: 90%;
    }

    div.button-container {
        align-items: center;
        justify-content: flex-end;
    }

    div.button {
        cursor: pointer;
        height: 30px;
        margin: 0 10px;
    }

    div.button img {
        height: 100%;
    }
</style>

{{#if disableOnFullscreen}}
<style>
    viewer:fullscreen nav-bar {
        display: none;
    }

    viewer:-moz-full-screen nav-bar {
        display: none;
    }

    viewer:-webkit-full-screen nav-bar {
        display: none;
    }
</style>
{{/if}}

<div class="flex-container" id="model-metadata">
    <!-- holding the description -->
    <div class="thumbnail">
        <!-- holding the thumbnail 
        <img src="{{thumbnail}}" alt="{{title}}">-->
    </div>
    <div class="title-container">

        <span class="model-title">{{#if title}}{{title}}{{/if}}</span>
        <span class="model-subtitle"> {{#if subtitle}}{{subtitle}} {{/if}}</span>
    </div>
</div>
<div class="button-container flex-container">
    <!-- holding the buttons -->
    {{#each buttons}}
    <div id="{{id}}" class="button">
        {{#if text}}
        <span>{{text}}</span>> {{/if}} {{#if image}}
        <img src="{{image}}" alt="{{altText}}"> {{/if}}
    </div>
    {{/each}}
</div>