Collapsed DIV borders using CSS3 box-shadow

This is a neat little trick I’ve been using some time now and I hope this will be of help to others too, especially to young developers. Suppose you have 3 divs that are stacking on top of each other and you want to give each one a border. Your first instinct would be to use something like ‘border: 3px solid #444;’. However, it will probably look like this:

Which isn’t very appealing… We do not want the bottom border of div A to pile up on the top border of div B, and B to C. That’s where box-shadow comes in! By playing around with it’s value, box-shadow will become the border itself. Which means you no longer need the ‘border’ property.




See the Pen Collapsible div borders using CSS3 box-shadow by Elmer Balbin (@elmzarnsi) on CodePen.27172

This is not to say there are no other solutions. There are, but I find this one the easiest 🙂

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Elmer Balbin

Web developer from Bacolod, Google Local Guide, and casual DotA 2 player.

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Give overflow-y:scroll; to .box and the scrollbar will overlaps with the “borders”.

It is good for tables which contents are small or without overflows though,