<style>
    article.mainDashboard{ height:100%; }
    article.mainDashboard>section:first-of-type{ 
        height:100%; 
        background-color: #333;
    }
    canvas[data-output="ttbCanvas"]{
        width: 100%;
        height: 100%;
    }
</style>

<canvas data-output="ttbCanvas"></canvas>
