.sidebar {
    position: fixed;
    left: 0;
    top: 0;
    bottom: 0;
    width: 90px;
    min-width: 90px;
    max-width: 90px;
    height: 100%;
    overflow: hidden;
    background-color: #1d283c;
    transition: all 0.5s ease;
    z-index: 1040;
}
.sidebarBack {
    position: fixed;
    top: 0; right: 0; bottom: 0; left: 0;
    background-color: rgba(0, 0, 0, 0.5);
    cursor: pointer;
    transition: all 0.5s ease;
    z-index: 1039;
    opacity: 0;
    visibility: hidden;
}
.sidebarBack.active {
    opacity: 1;
    visibility: visible;
}

@media screen and (max-width: 769px) { /*mobile*/
    .sidebar {
        width: 200px;
        min-width: 200px;
        max-width: 200px;
    }
    .sidebar:not(.active) { left: -200px; }
    .sidebar.active { left: 0; }
}