Centering the scale on a map

[Anonymous User]

Does anyone know how to center the scale that is on the flex viewer app?  I have added a scalebar selector in my stylesheet, the code is below:

esri|ScaleBar
{
 right: 10;
 bottom: 20;
 left: 800;
 top: NaN;
 
}

This basically pushes the scale 800 pixels to the left.  What I want to do is print the scale in the direct center of the map.  Is there a way that I can get the width of the page and use it in the stylesheet to compute the center of the map??? 

Thanks,