@julienw , If you change the height of the header in action menu BB we could have a potential issue. See attached screenshot.
![screen shot 2013-11-22 at 12 29 25](https://f.cloud.github.com/assets/1416057/1600196/9c41fbd4-5369-11e3-8017-385f522c2bfb.png)
The content of the action menu, to be able to scroll under the header has this rule: `max-height: calc(100% - 13.5rem);` 13.5 comes from the size of the header + the last button (white one).
I feel more comfortable if we don't change the BB to `min-height: 5rem`, as is a more flexible rule it could cause this unwanted issue.
So would prefer you overwriting the BB (even with !important) in your app.