:root{
    --nav-height: 128px;
}

.navSpacer {
    display: block;
    position: relative;
    height: var(--nav-height);
    width: 100%;
}
.navBlock {
    position: fixed;
    height: var(--nav-height);
    top: 0;
    left: 0;
    width: 100%;
    background-color: #CCCCCC;
}