How to change titlebar height

For mobile I like to have smaller titlebar.

I tried with following css:

```
.wb-body {
    top: 15px;
} 
.wb-icon {
    height: 15px;
}   
.wb-title {
    line-height: 15px;
}
```

It almost worked, but when minimized, the element height is still fixed 35px so that is somewhere hard coded?
