The appearance configuration for the major and minor axis grid lines
(see example).

color? string

The color of the grid lines. Accepts a valid CSS color string, including hex and rgb.

dashType? DashType

The dash type of the grid lines.

skip? number

The number of lines to skip at the beginning.

step? number

The tick-rendering step. Renders every nth line, where n is the step.

visible? boolean

If set to true, the Chart displays the lines.
By default, only the major axis grid lines are visible.

width? number

The width of the lines in pixels.