Platform type craft traveling low over forest with lights illuminating the top but no lights on bottom, at night.

I was driving with my wife and noticed this unusual object moving quickly over the tree line of the forest preserve.Watching it reminded me of a flat bed truck traveling down the highway at too fast a speed. Since the quality of the light was so unusual and I do not draw well, the image I attached is more of a schematic.The single arrow in front of the craft shows the forward movement. The very back was not illuminated; I represented this by shading that area. The side I could see best had enough light to show a sharp edge, but I had no sense of how tall the side was ...except that it was very close to the trees. I believe I saw two rows of four dim blue/violet lights that nicely light almost all of the platform surface. There was a second, less defined, yet radiating, light source coming from the front in a hue somewhere between a warm white LED bulb and yellow represented by the three grouped arrows. It was a bit brighter in both color and intensity and intermingled with the other color to some extent.
For the question about the size of the object, it was really more like the size of two pennies at something like a two to one ratio.
Even though the sighting was very brief, it made a strong impression. And even though it made a strong impression, I would not have made this report if I didn't have another event two days later. My notes are from two days after this experience.