To help with branding and theme for your communications, custom letters can have an on brand colour used. See Letter Templates for more information before commencing. 

Go To System>Setup>Letters Setup

Select Template or Create New

Select Background Colour Tool

Type In Colour Name For Basic

Type in basic colour name, such as Red or Dark Blue. Click ‘OK’ to apply. 

Enter Hex For Specific Colour

Enter Hex code if using one for branding or website to match, such as #00008B for Dark Blue.