`clicking on ".cross-og" toggles class "open-nav" on ".navigation-overlay" clicking on ".cross-og" toggles class "darken" on "#root" clicking on ".cross-og" toggles class "darken" on ".menu-btn" clicking on ".menu-link" toggles class "open-nav" on ".navigation-overlay" no-prevent clicking on ".menu-link" toggles class "darken" on "#root" no-prevent clicking on ".menu-link" toggles class "darken" on ".menu-btn" no-prevent clicking on ".menu-btn" toggles class "open-nav" on ".navigation-overlay" clicking on ".menu-btn" toggles class "darken" on "#root" clicking on ".menu-btn" toggles class "darken" on ".menu-btn"`