Well, it seems like the slider plugin is "playing" visual tricks on you. The images inside the a elements are not the ones that are seen (you can tell because they have visibility: hidden ). The plugin is using another img tag for the main image and that is a little further down ( img class="nivo-main-image" ).
THAT is the image that you need to apply your ndcustomcolorclass class on. The trouble is that image is generated dynamically so you probably can't just add a class on it to begin with. I can see at least 2 options.
I cant really gove you an answer,but what I can give you is a way to a solution, that is you have to find the anglde that you relate to or peaks your interest. A good paper is one that people get drawn into because it reaches them ln some way.As for me WW11 to me, I think of the holocaust and the effect it had on the survivors, their families and those who stood by and did nothing until it was too late.