I have this setup at the moment. I would like it so that when you hover over a box the bottom border changes to the same colour as inside the hovered div. I am starting to think this cannot be done with just css, but how would you add javascript to do this?
Any guidance would be appreciated
Overlap div container border with item border on hover
Unlike the other answers posted, this solution will allow you to keep the border line on the bottom: http://jsfiddle.net/hCK3D/15/ and your white vertical lines will continue to appear correctly.
The idea is that the border from the bottom is now set in the item, and when the item is hovered the bottom border changes colour to match the hover colour. Also the container border is set for the purpose of the white vertical lines, but on hover the item hover border bottom appears in front of the container border.
See the JSFiddle for source