Labels float left. Inputs appear inline after labels on right hand side. Labels widths are 20% of box width.
Ex. 1: Inputs have 0 left margin and butt up against labels.
Ex. 2: Inputs have a left margin of 20%. This is the same width as the labels. Rather than moving away from the labels, it appears that the margin "covers" the labels because the margin is being measured from the inside left edge of the box, not from the right edge of the labels.
Ex. 3: An additional 20% left margin added to inputs. They now sit 20% to the right of the labels.