HostBrandColour
One colour of the host brand.
namerequiredstring- The colour's name, which the page styles are keyed by. Unique within the host brand without regard to case.
redrequiredinteger- The red channel.
greenrequiredinteger- The green channel.
bluerequiredinteger- The blue channel.
alpharequirednumber | null- The opacity from 0 (clear) to 1 (solid), to three decimal places. Null only for a colour stored without one.