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I want to be able to alter the appearance (font color and fill) of a column of numbers using conditional formatting, based on being greater than or less than the numbers from another column. I am using Excel 2016. I am unable to get any formula to work. Please help!

Hello I am trying to highlight a cell one of two ways based on condition. So for example Cell C3 is the previous run time, and cell C4 is the most recent run time. I want cell C4 to highlight red if the value of C3 is less than C4, but I want the cell to highlight green if the value of C3 is greater than C4... how do i two this two level conditional formatting?