Question

This question has already been asked in a different situation.

I am trying to achieve a seamless photo grid with jQuery Masonry.

Check out my fiddle:

http://jsfiddle.net/drw158/sAkjv/

There is a vertical gap. Why?

Answer 1

Display your images as block-level elements:

.ct-coll-item img {
  display: block;
}

See if this works: http://jsfiddle.net/drw158/sAkjv/1/

As for the why, I have no idea. My guess would be because the images are inline elements, but that isn’t a direct explanation.