HTML Email Fix for Gmail

We have Few HTML mailesr that looks fine in a browser but falls apart the moment it lands in Gmail: the layout shifts, stacked columns break, and several inline images refuse to load. Right now the code depends on an external CSS file, which most email clients—especially Gmail—ignore or strip... (Budget: $30 - $250 USD, Jobs: CSS, Email Handling, Email Marketing, HTML, HTML5, PSD to HTML)