New Post: Normal Style

Is it possible to modify the "normal" style under the styles block in excel?

I know you can set and change the default style, but we need to modify the "normal" style.

Example:
If I open excel the default and normal style is set to font size 8.
If I create a new excel file using ClosedXML I set the style to font size 8, but then the default is font size 8 and the normal style is font size 11.