section {
    padding-top: 50px;
    padding-bottom: 50px;

    /* min-height: 100vh */
}

.active-tile {
    position: absolute;
    width: 0;
    height: 100%;
    background-color: #dedede;
}

@media (max-width:991px) {
    .active-tile {
        height: 40px;
    }
}

header {
    position: fixed;
    right: 0;
    left: 0;
    top: 0;
    z-index: 1;
}