.root {
    display: grid;
    grid-template-columns: 8fr 4fr;
}

.leftCol {
    display: grid;
    // -64px, which is the header
    grid-template-rows: 50vh calc(50vh - 64px);
}
.lowerRow {
    display: grid;
    grid-template-rows: 1fr 64px;
}