how to reduce spacing between two buttons

[NCN]

1> Want to remove spacing between two button using .scss .
2> how it will fit over the tool bar or tab panel.

Please find below the image:-
button.jpg

[mitchellsimoens]

Inspect the elements. Is it margin or...?

[NCN]

These button I have created on the toolbar.Now I want three thing in this :-

1. Button boder color and width using scss.
2. No spacing in bweteen two button..
3. height of button shuld be same as toolbar height.

Thanks in advance.!!