How to change color of single header cell?

Hello. I have a QStandardItemModel, with QStandardItems in it, all in QTableView.

I have to make certain column headers to be different color and possibly different text. Let's post an example table then:
Attachment 10756
As you can see first colum and first row font is different because I tried changing color and other stuff in it with this:

Code:

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QStandardItem *col1 = new QStandardItem("Column 1");
col1->setForeground(Qt::red);
col1->setBackground(Qt::green);
col1->setFont(QFont("arial", 11));
 
setHorizontalHeaderItem(0, col1);

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So changing font works just fine, but colors, nope...
any ideas?

Nothing :(?

Maybe the widget style you use does not allow that.