Change the style of the border of the data labels
To change the style of the border of the data labels in a bar line, pie, area, point, radar, funnel, bubble, or box and whiskers chart through the External Style Sheet and Inline Style Sheet editors:
- Under Labels, select Data labels, click the More options button in the bottom right-hand corner of the right-hand area, and then find the Border group of settings in the dialog that turns up.
- Use the provided settings to change the style of the border of the data labels the way you want.