Left offset of the first tab in a Tabset

Details:
-SmartGWT 4.0
-SmartGWT 3.1
Development Environment: Jdk 1.7
Deployment Environment: Apache Tomcat 6.x
Database : Oracle 11g

Problem statement:
Please see the attachment, (a small screenshot from the showcase).
In a TabSet with one or more tabs, there is a bit of an offset between the left border and the left edge of the first tab. I want to get rid of this offset, so they sit flush against each other. Can this be controlled programmatically via any existing API ? If not via an API, is there an applicable CSS class that can be suitably amended?

Thanks in advance for your help.

Shrini

Attached Images

TabLeftOffset.png (3.6 KB)