How to make this line?

[Star..]

how can i add the blue line in this pic to my style? :
(the blue line that show before every catedory)

 

[Curtis129]

-------------------------------------------------------------------------------? lol

 

[Star..]

yea, this line afdter every category.
how can i do it?

 

[Hoxxy]

In your styles css find:
Category Strips (.tcat)

and add in additional css box to the right:

border-top:1px dashed #FFF;
border-bottom:1px dashed #FFF;