:root{
    --fn_nav_height: 2.0rem
}

.extrabody-content{
    /* border: solid #00F 2px; */
    background-color: #EFEFEF;
    height: var(--fn_nav_height);
}


.wy-grid-for-nav {
    top: var(--fn_nav_height);
    height: calc(100% - var(--fn_nav_height));
    height: 100%;
    overflow-y: auto;
    position: fixed;
}


.wy-nav-side {
    top: var(--fn_nav_height);
    z-index: 2;
}