.sidenav {
    background-color: #333 !important;
    color: white !important;
}

.sidenav a:not(.btn), .sidenav span {
    color: white !important;
}

.sidenav a.nav-link:hover:not(.active), .sidenav a.nav-link:hover:not(.active) span {
    color: #333 !important;
}