Hubs, sections and chapters can each be given a colour to help readers tell them apart at a glance. In the relevant dialog, click the Colour field to open the colour picker. You can drag the selector across the gradient, choose one of the preset swatches, or type a specific hex value for an exact brand colour.
Colours are optional. If you'd rather not use one, you can leave it blank or use the Remove colour link to clear a colour you've already chosen.
