How to customize nvd3's tooltips and remove labels from x axis

Question

I have this chart, but as you can see it has some problems:

1. The tooltip height is wrong, there is that ugly blank space at the top. Since nvd3 has no documentation I really don't know how to proceed;
2. The x axis labels are all overlapping, I want either to remove them or to tilt them (like 45 deg.). The second option is best. I also tried .staggeredLabels(true) but they still overlap.

EDIT: I solved the second one by removing labels. Actually I don't remove them but rather hide them with:

.nv-x text {
    display: none;
}

Answer 1

The blank spot is actually the key. It seems like maybe your object doesn't have a name?

Answer 2

Since no one answered I just post the solution to the second problem:

.nv-x text {
    display: none;
}