Fine tune bar frame position/size.

This is for reporting video status. The bar frame shall connect to
http://g0v.github.io/live/status_bar.html for viewer to report live
video status. See: https://g0v.hackpad.com/-Live-VVlHNqKaQrC.
Merge pull request #51 from jeffhung/barframe

Fine tune bar frame position/size.