html,
body {
    height: 100%;
    margin: 0;
    background: #f0f2f5 !important;
}


.na-stackingRows {
    display: flex;
    flex-flow: column;
    height: 100%;
    width: 100%;
}


    .na-stackingRows > .top-row {
        flex: 0 1 auto;
        /* The above is shorthand for:
      flex-grow: 0,
      flex-shrink: 1,
      flex-basis: auto
      */
    }

    .na-stackingRows > .row {
        flex: 1 1 auto;
    }

/*
.box.row.footer {
  flex: 0 1 40px;
}
*/