Below is a link to a HTML file that has some CSS and code for starting a mobile friendly email. Here are also some tips:

• Don’t use margins: Outlook doesn’t like it
• Padding: give the containing table a width but no padding and then the inner table’s data cell padding but no width.
• No padding on images, again Outlook. Use padding on the containing td.
• Giving spans a display:block doesn’t work (outlook)
• Give images px widths on desktop, otherwise they could mess up the % widths of the tds.
• I use http://inliner.cm/ to convert my css into inline css

Download Template