Category/Page Bar borders

I would like to change my borders so that they are only showing on the sides of the category name. I noticed that the options only allow you to have a full border, however I only want a border on the sides of each category/page title.

I have tried various ways of using the html/css inserts but have gotten no where. When I've tried that it has either stayed the same as the options has selected (full border) or (if i clear those options) then there is no border at all.