how to set a global org publish export setting in emacs
Solution 1:
You can customize org-export-html-style and org-export-html-style-extra.
The first has all the default values for org export, so you'd better leave as is unless you want to override everything.
org-export-html-style-extra gets appended after the default style definition with your own variations.
I use this setting:
"<style type=\"text/css\">\n html {\n font-family: sans-serif;\n font-size: 11pt;\n }\n em { font-style: normal; font-weight: bold;}\n</style>"