we have a rule for the navigation panel
```
[role=navigation] {
  z-index = 3;
}
```
and another one for the step indicator:
```
.step-state {
  z-index = 100;
}
```
so to state clearly that we are positioning `#tutorial` over both of them, I'd rather to use 101 (or 110, or 200) for this z-index.
Another thing that we should do (different problem, different bug) is to manage the chaos of z-indexes that we use in FTU :D