How to Change color for drop down value in Incident Management

Hi Experts,

My Requiremet is to change the order of color that are now displaying for Impact dropdown now in incident management. If the impact is down it should be in red, but showing white and if it is major yellow which is showing correctly and if it is minor it should be which but showing red. I want to know how to change the colurs of this field. And need to know where they are defined. And am using SM9.4.

PFA

Please suggest me solution for the above issue. Thanks in Advance.

Regards,

Abarna Arunraj