Presumably you're using Conditional Formatting?
Select all of the cells you want to conditionally format, then, noting which is the active cell It has a slightly different highlight and is often the top left cell of the range if that's where you tarted selecting from as you dragged the mouse), enter the conditional formatting formula as if you were doing it for just that cell, but remove the $ symbols from the formula, or at least the $s before row numbers.
The whole selected range will now have the conditional formatting you want.