在悬停高度过渡不起作用

I was working on some transition related boxes where I bumped into this problem. Here are some images with grey scale. When you hover on them they come to their normal state. What the actual problem is when you hover on the image there is a class with border and specific height that is being displayed. I gave specific height to the class and when you hover on image the height of the class should increase and stop at one particular point. But, the height transition is not working.I was working on some transition related boxes