Formatting Report Colors

Hi Everyone, I'm sure this is an easy solution for the experts in this community! I appreciate your help, in advance! Is it possible to change the default blue color for the grouped by row in a report. I have a report grouped by parent column that works very well. However, the default color of that row is not working/too dark for some of the report readers. I do not include the grouped by column in my report view. A screen shot is attached. Any assistance is welcome! Kate Sheehy