StoryLine 2 HTML5 output - Small line display after previous icon?

In the HTML5 output version a small line appears after the previous button depending on the size of the browser.  See image in attachments.

Here is the code in story_html5.html 

<div id="control-previous" class="controlbar-button right" style="display: block;"><a class="icon previous-slide"></a></div>

I would like to remove this small line that does not appear in the flash version. Has anyone ever done a fx in css to solve this problem?

 Thanks a lot

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