body {
    display: block;

    height: 100%;
    width: 100%;
}

nav-bar {
    display: block;
    height: var(--nav-bar-height);
    grid-area: nav;
}

edev-tabs {
    /*height: 100%;*/
    /*grid-area: tabs;*/
}

iframe {
    display: block;
    height: 100%;
    width: 100%;
}