Change background color of readonly columns

[Tim Ryan]

My question is very simple. How do I change the background color of any column that is readonly? I tried using the 

readOnlyCellClassName option, and I can change the text color, but not the background.

Thanks

[Tim Ryan]

I'm answering my own question. I ended up using a renderer for all my readonly columns. This did exactly what I wanted.

[Elye Mittelman]

Or you can add styles in your css for '.htDimmed' something like 

.handsontable .htDimmed {
   background-color: red !important;
}