How to remove the grey border of the datagrid and the grey b

[user080701]

How to remove the grey border of the datagrid and the grey background of the datagrid footer?

[user080701]

Now, I can remove the border and footer background by columnClass and footerClass, but I still cannot remove the header background. No effect for the headerClass !!!

I try to change the xxx.skins.properties file
headerBackgroundColor=#FFFFFF

And the background color is remove, but this parameter is globally. I only want to change the one page.

How can I do it?

I also try to add the follow script on the page that I want to remove the header background color, but no effect.

.rich-table-headercell {
headerBackgroundColor:#FFFFFF;
}

Please help. Thanks