HTML Mailer - adapt for Win 10 client -- 2

We have an existing mailer that displays well in most mail clients. It has some formatting issues in Win 10 clients and Gmail app. We need to ensure it's displaying properly in all clients. I've attached the html. Please note that it displays correctly on most mail client, we just need to check compatibility with Windows 10/Gmail app and other popular mail clients to ensure it also displays correctly there. I suggest a tool like https://www.litmus.com/ for testing to ensure it's working on all mail clients.