this has 66.667% but with box-sizing:border-box we are fine

this has 66.667% but with default boxing set to content-box, we get a float drop

• float drops occur when columns cannot fit going across, 33%+67% allocates no space for border.
• never use pixels as widths
• aokay to use percentages .navBar 18.75%; .content: 81.25%;