How to show horizontal scrollbar

[clabnet]

I have this tree

When is expanded a nested node it should be useful add a scrollbar on the bottom panel.
Strange case, but adding class "overflow-x" = auto it show another vertical scrollbar.
Please, how to add a scrollbar x ?

[lycHub]

You can first add " white-space: nowrap" to ".vir-tree-node";
Add "overflow-x: auto" to the upper container of the root element ".vir-tree";
Try it out

[clabnet]

@lycHub : Thank's for your reply.

Unfortunately it seems don't working...