主体中的Bootstrap模态对话框中心图像

I am trying to center an image (both horizontally and vertically) in a modal dialog body. I have tried every permutation of everything I know. top / left = 50%, margin 0 auto, class=center-block... Read through the bootstrap documentation and I am stumped. Here is my html... Any help would be greatly appreciatedI am trying to center an image (both horizontal