The width of this sidebar is 120px and the width of the right sidebar is 162px. The widths should not change when the browser's fontsize is changed.
- The menu's fontsize is 16px. Menu buttons are 120px wide and 24px high.
- The page header area has a height of 96px.
- The menu is centered and relatively positioned at (0, 0) within a <div> named 'topnav'. 'Topnav' is absolutely positioned at the bottom of the header area. This causes the menu to remain fixed to the bottom of the header area regardless of how the default font-size is set in the browser.
