A few of the featured images are displaying in the grid on the Portfolio Frontpage with white space below them. I thought it was probably only images with a very wide landscape aspect ratio, but some of them are actually portrait aspect ratio.
https://www.dropbox.com/s/5rehbjw1xt9hnqt/Screen%20Shot%202015-11-05%20at%2020.00.13.png?dl=0
1. Why might some images be doing this? Is it to do with aspect ratio, or size, or something else?
2. How can I adjust the CSS to make sure the images fill the whole space?