These are the predefined colors that you can use inside the layout definition. Otherwise, you can refer to any color by using its corresponding hexcode (e.g., #ffffff):
             
              - yellow.light
 
              - yellow
 
              - yellow.dark
 
              - blue.light
 
              - blue
 
              - blue.dark
 
              - red.light
 
              - red
 
              - red.dark
 
              - green.light
 
              - green
 
              - green.dark
 
              - orange.light
 
              - orange
 
              - orange.dark
 
              - black
 
              - white
 
              - gold
 
              - gray.lighter
 
              - gray.light
 
              - gray
 
              - gray.dark
 
              - gray.darker