HTML email is the use of a subset of HTML and CSS to format an email message like a web page using colors, graphics, table columns and links.
Useful Links:
Progressive Enhancement with Media Queries
For clients that support media queries, any of the examples above can be progressively enhance the button.
Eg.
@media screen and (-webkit-min-device-pixel-ratio: 0) { /* Insert -webkit-targeted CSS here */ }
Add more horizontal padding in Outlook
Conditionally adding non-breaking space on each side of a button link can increase the horizontal padding for Outlook. Especially useful for border-based buttons.
`<!--[if mso]> <![endif]-->Link Text<!--[if mso]> <![endif]-->`