Hello Sulada,
To hide the Column Header, Row Header and Measure Header of Pivot Grid and change the color of it you have to change the following style as:

<style>
//for Change the color
 .ui-widget-header{
  background: yellow;
  }

//For Hide the row  
  #pivotGrid_measures {  
    display : none ;
   }
  #pivotGrid_columns
  {  display : none ; }   
  
    </style>
I am attaching the sample project use to test. Please find the attachment to achieve the desired behavior in the Pivot Grid.

In the sample I changed the Pivot Grid color as black.