I can't say I know what to tell you exactly, but the reason for that is that there might be a few ways to do it and it also means you already need to have been working on it to tell us what you've tried. This forum is helpful, but it mostly helps with exact situations within the program and not the "how-do-I-do this" type of scenarios. Sometimes how something is done is quite complicated, especially without a present working understanding of what you want to do.
What have you tried?
There are ways to control colors and displacements based upon heights.