OptionalblurHow soft the shadow's edge is: the standard deviation of a gaussian blur in pixels, like Image.blur. Default: 0
OptionalcolorThe shadow's color, its alpha is the shadow's opacity. Default: 0x00000080 (50% black)
OptionalexpandWhether to make the image larger so the shadow isn't cut off. Without it, the image keeps its size and the part
of the shadow outside is lost. Default: true
OptionalspreadHow far to grow the shadow's shape before blurring it, in pixels. Default: 0
OptionalxHow far to move the shadow to the right (negative values: to the left), in pixels. Default: 0
OptionalyHow far to move the shadow down (negative values: up), in pixels. Default: 0
Options of Image.dropShadow