Lighting Issues

I am making a 2D sidescroller and I want everything to be lit up the same amount. If I import a yellow block I want it to stay yellow and not turn black around the edges. I have tried all types of light and 1 of 2 things happen. It doesn’t even make a light at all, or it is yellow with black around the edges. Please Help! Thanks!

Use unlit materials, turn off post process effects like bloom and vignette.