Padding top?

It seems the top padding cannot be fully configurable, because there is a "burned in" number that cannot be overridden (it can be with negative numbers, which is a working trick, but not too elegant...):

https://github.com/c3js/c3/blob/0.4.11/c3.js#L386

Start at c3.js around line 386, where the issue identifies the fixed top-padding value. Trace how chart padding is read and applied, then determine how the top padding can be made fully configurable without relying on negative values. Done means the chart honors the configured top padding directly.

Written by the indexing model from the issue text.