A family of Microsoft spreadsheet software with tools for analyzing, charting, and communicating data.
Select column B (or the part that you want to format conditionally).
Let's say that B1 is the first cell in the selection.
On the Home tab of the ribbon, click Conditional Formatting > New Rule...
Select 'Use a formula to determine which cells to format'.
Enter the formula =D1>E1
(If the first cell in the selection is B3 instead of B1, use =D3>E3, etc.)
Click Format... and specify the desired formatting.
Click OK twice.