Usage
{{co|<text color>|<background color>|<text>}}
Example
{{co|red||This text isn't yellow.}} This text isn't yellow.
{{co||green|This text has a green background.}} This text has a green background.
{{co|#0033CC||This text uses an HTML color code.}} This text uses an HTML color code.
Note the double brackets || which means that that section is empty. Do not miss brackets, all three are needed.