flex-menu via http:https://codepen.io/KenanYusuf/details/JKEjOR/ See also: http:https://codepen.io/fcalderan/pen/GZydQX https://github.com/VPenkov/okayNav/ https://github.com/StefanKovac/flex-layout-attribute/