Appearance changes

Summary

I want to make changes in appearance like want to change icon image color to red which white in default.

Content

There is a specific requirement to have icon image color in red and background in white with top red header for one of the client. I have added white back ground and top red header. However I am not able to change icon image color to red. Is there any option available to do so ?

Your help will be appreciated in this regards.

Thank you,

Trush