Welcome to the Forum Tunnel_Snakes!
There are two ways to do this. The way you tried using two rules should work, and should not format all cells. I cannot tell you why that didn't work without seeing your file and what you did.
The other way is to use a single rule that uses "Use a formula to determine which cells to format" where the formula is
where A1 is the upper-left cell of the range you want to format.
If you are still having trouble it will help to attach your file with any private data removed. The paper clip icon does not work for attachments. Instead, under the text box where you type your reply click the Go Advanced button. On the next screen scroll down and click on Manage Attachments, which will show a pop-up window to Select and Upload a file. Then close the window.
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