org-html-toplevel-hlevel

org-html-toplevel-hlevel is a variable defined in `ox-html.el'.
Its value is
2


Documentation:
The level for level 1 headings in HTML export.
This is also important for the classes that will be wrapped around headlines
and outline structure. If this variable is 1, the top-level headlines will
be

, and the corresponding classes will be outline-1, section-number-1,
and outline-text-1. If this is 2, all of these will get a 2 instead.
The default for this variable is 2, because we use

for formatting the
document title.

You can customize this variable.