How to change background color in grid superheaders

To change background color in grid superheaders;

• Open Designer Interface,
• Go to the ‘Stylesheet’ module.
• Add a new stylesheet.
• Enter the CSS rule for changing the background color of the grid superheaders.
• Save the stylesheet by clicking on the “Save” button.

th[class*="superheader"]{
    background-color:navajowhite!important;
}