I have a ss in which I am trying to apply conditional formatting to a particular cell with 3 criteria. The problem is that even blank cells are being formatted.

Here are the criteria I am looking to format:

If M6 is between -50 and 100 cell needs to be yellow
If M6 is between -51 and -100 cell needs to be silver
if M6 is between -101 and -150 cell needs to be red.

I believe I need to base it on a formula but can't seem to get it to work. Any help would be appreciated.