HD users:
RECENTER your stream - via custom stylesheet ...
just add :
#content #contentPane {
max-width: 960px !important; margin: 0 auto !important;
/* and optional */
box-shadow: 0px 4px 16px 0px rgba(0, 0, 0, 0.2);
}
just a second, making a screenshot...

however, find a sample .css here:
http://the-a-team.info/deliver/_safari.css

Not sure, which browsers support custom/user stylesheets, but
in Safari, select Safari->Settings(Einstellungen)->last tab->stylesheet,
load css and restart Safari...

For Firefox, see +Tim P. comment
For a better js alternative, reducing mouseways, read +Dave Gööck comment
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