Set default font size in WYSIWYG editor

In setting up a custom app we have a Notes field using a TextArea with the editor set to WYSIWYG. When the user is editing the form using Inline Form the text is defaulted to 10. I have loaded the font plugin and can change the font size manually. I was wondering if all text can be set to default to a larger size (16px to be exact)? We are using XWiki Enterprise 7.4.4 with the default WYSIWYG editor.

Thanks,
Steve

On my wiki at http://massol.myxwiki.org/xwiki/bin/view/Blog/ , I use a custom theme. I put the following in the advanced section:

body {
  font-size: 18px;
  line-height: 27px;
}

Maybe this helps.