You can add rectangular, circular, or rounded rectangular borders to individual label components. 
- In the Label Style Composer dialog box, click the Layout tab. 
 
- Select a component from the Component Name list. 
 
- Under Border, change the values for Visibility, Type, Gap, Color, Linetype, Lineweight, and Background Mask. 
Tip:  You can specify a Gap value and set the Visibility value to False to add space around the label component without actually inserting a border. 
  
- Click OK.