Another clue:
The code above is for decorating each sidebox individually. Since you want to enclose them all in one box, you will need to apply the logic to larger units.
NavColumnOneWrapper encloses all the left sideboxes, as you will see if you use the FF Web developer tools, and navColumnOne encloses that. So you can put the top & sides of your border in the outer entity and the bottom in the next inner one so it covers the lower ends of the sides. Adjust margins & padding in all places necessary and you will be done. (I know, easier said than done, but work on it, experiment, and study CSS if necessary. You will be better prepared for your next project.)![]()




