The Shadow Stroke pane allows you to add a border around the shadow you created in the Shadow Brush pane.
Brush Type — This drop-down list lets you change the brush type of your property.
Brush Color — Depending on which brush type you select, the brush color list will populate with the colors available for that brush type.
Relative Bounds Editor — This pop-up menu displays two bounds editors, Relative Bounds and Relative Clip Bounds, that allows you to determine the size and location of your brush element.
Style — This value specifies the dash style of the shadow’s border.
Thickness — Set this value to an integer from 0 to 100. This value specifies the thickness of the shadow’s border.
Alignment — This value specifies the position of the shadow’s border.