Corner properties

OK, I give up. I have been reading everything, going through the tutorial, disecting the JS code and I still am coming up short on an answer to this...

What CSS or grid function or property do I use to control the look of the upper left corner box? I have got full control over the column headers and the row headers but nothing I do changes the look of the upper corner and I need it to match the color/style of the rest of the grid.

Thanks,
Jim

found it:

.active-scroll-corner .active-box-item {background: #C6C3C6}
.active-scroll-corner .active-box-normal {background: #C6C3C6}

I think I tried every combination of active-xxx-xxx and didn't find it but saw a post by someone else on a related topic that had this in it and I tried it and it works.

Jim