.offcanvas-sidebar .wrap-canvas-menu .widget_nav_menu .offcanvas-menu .menu-item:nth-child(odd){
    background-color: #5dbeb7;
}

.offcanvas-sidebar .wrap-canvas-menu .widget_nav_menu .offcanvas-menu .menu-item:nth-child(even){
    background-color: #aed2a2;
}