It is not possible to center the toobars using CSS (or script).
It is essential for the proper rendering/positioning of the toolbars that they have a float:left
setting - this is how they "fill" the available toolbar area in the most efficient manner and break to new lines automatically if the editor size is changed (enlarged or reduced).
We are not able to provide a suggestion how toolbars can be centered without it messing up their look and feel.
the Telerik team
Check out Telerik Trainer
, the state of the art learning tool for Telerik products.