I want to have my menu width <Col span={6} offset={8}>  and my content <Col span={10} offset={7}>. How do I do that?
  <Row>
    <Col span={6} offset={8}>
    <Tabs defaultActiveKey="2" >
      <TabPane tab="About" key="1"><About /></TabPane>
      <TabPane tab="My Projects" key="2"><MyProjects /></TabPane>
      <TabPane tab="Contact" key="3"><Contact /></TabPane>
    </Tabs>
    </Col>
  </Row> 
This code smashes everything in span={6}

 
    