I am making a label + form as follows:

```
<Form horizontal>
  <FormGroup>
    <Col xs={5} className="xxx">
      <ControlLabel>
        somekey:
      </ControlLabel>
    </Col>
    <Col xs={7} className="yyy">
      <InputGroup>
        <FormControl value="v"/>
        <InputGroup.Button>
          <Button>
            km
          </Button>
        </InputGroup.Button>
      </InputGroup>
    </Col>
  </FormGroup>
</Form>

```

However, it seems like the height of the the `ControlLabel` part is different from `InputGroup` part, after I added a `background-color` as shown in the attached image. Am I doing something wrong?

[![enter image description here](https://i.stack.imgur.com/BbNYz.png)](https://i.stack.imgur.com/BbNYz.png)