Highlight row if values if columns x and x+1 match.

[freeword]

Helo and thank you for your time. I am trying to highlight rows when the value in a column match AND are next to each other. Sample files attached with the desired result . Basically like this,

Blue
Orange
Green
Green
Orange
Grey
Blue
Orange
Orange
Silver
Black
Blue

[6StringJazzer]

Your sample is not the same as what your title or description say so I am going to go with your list.

You need two conditional formatting rules. Let's say your data is in column A.

Applies to A:A
=A1=A2

Applies to A2:A?? where ?? is the highest possible row number you expect to use
=A1=A2