pikaclint on "[Plugin: Contact Form 7] responsive Outgoing mail with css"

hi i'm new to wordpress, i am trying to make an email template for my contact form outgoing mail with css. i have 2 questions
1. What do you recommend for a universal email template should i use floats or inline blocks?
2. I read that when adding css to email templates it has to be inline and not exteal is there a way to apply media queries? since it doesn't work for inline styles.

https://wordpress.org/plugins/contact-form-7/