fotographie front page 3 column “feature” thumbnails not displaying properly

Hi there, I'm looking for a css fix so that the 3 column featured image section on the front page does not break and put the 3rd image on the next line in portrait mode on an ipad. I hope i have explained the issue well enough. i have searched this forum and have not yet found the solution. Please inform me via email if you need further description of the problem I am having. Thanks.