Our labels have a default height because of extra top and bottom padding. The label is as high as a textfield. This is great if the text is left or right to a textfield, but for simple text labels without textfield this is not stylish.
We have additional styles regarding padding:
f_padding_top_0 f_padding_top_2 f_padding_bottom_0 f_padding_bottom_2
0 means no padding
2 means half default padding
As usual, add the style to your label
Style.addStyleNames(label, "f_padding_bottom_0");