How Can I Add Gap/Space Between Two Button In VerticalLayout?

I have added two buttons in a verticallayout which in turn is in a horizontallayout.

I would like to add some space between the buttons.

I could see no style properties on the verticallayout.

I then added a style class to it and wrote a css wherein I gave margin to buttons and padding.

Nothing seems to work.

What am I missing here?

Thanks

Amjad