add horizontal divider in matrix table

I would be very grateful for any help, I have already read dozens of community posts and tried a few, unfortunately without success.

I would like to separate the individual rows in a matrix table by a light grey horizontal line after the 1st row to the bottom.

Any ideas how to get from:

to:

Page 1 / 1

Adding the below CSS to the Style section of the Look & Feel is working on my end:

.Skin .Matrix table td, .Skin .Matrix table th {
border-bottom: 1px solid gray;
}

Oh wow, that was so easy.

Thank you very much!!

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