Is There a Way to Make a Text Box Scroll One Whole Line at a Time?

skendall Community Member Posts: 8
We're working on a module that has a narrator and we've included "closed captioning" so that users can read along with what the narrator is saying. We'd like to do this by simply putting a caption box at the bottom of each page that is 2 lines of text tall (at 10pt font) and allowing the user to scroll down to read it, along with the narrator.

The problem is that when you click the down arrow on the text box it doesn't scroll one whole line of text, it only scrolls maybe 90% of the line, so as the user clicks the down arrow to follow along, the text on the top line keeps moving upward. It really messes it up if they decide to click the up arrow.

Here's a link to show you what I'm talking about.

Is there a way to make clicking the down arrow scroll one entire line of text at a time?