Having some problems with conditional formatting in Google Sheets

So I have two sheets together and I’m trying to change the colour of a cell in one sheet based on if a range in the other sheet contains a certain value.

For example, in sheet 1 I would like cell A1 to turn red if the word “cat” occurs in a cell in the range A1:A20 in sheet 2.

I feel like this should be possible, but I’m not certain. Thanks for any help.