How to convert css in head to inline css?

How to convert css in head to inline css?

Solution:

Paste the whole html/css code into -

http://premailer.dialect.ca/

Creating a Simple Responsive HTML Email

https://webdesign.tutsplus.com/articles/creating-a-simple-responsive-html-email--webdesign-12978

How to: Code a Responsive Email from Scratch

https://litmus.com/community/learning/24-how-to-code-a-responsive-email-from-scratch

Mobile Friendly Newsletter

https://www.campaignmonitor.com/dev-resources/guides/mobile/