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SurveyJS
Open-Source JSON Form Builder to Create Dynamic Forms Right in Your App. With SurveyJS form UI libraries, you can build and style forms in a fully-integrated drag & drop form builder, render them in your JS app, and store form submission data in any backend, inc. PHP, ASP.NET Core, and Node.js.
Why is it happening ? Every email client has different compatibilities with html and css. An awesome website to visualize that is caniemail. It is the email counterpart of can-i-use and has information on every compatibility issues regarding emails. On caniemail, you can see that flex-direction: column isn't supported on gmail desktop, but is on macOS mail: everything becomes a little clearer!. Furthermore, looking at the global ranking, everything on macOS usually works well, while it isn't the case on windows and web-native counterparts. Let's figure out a solution!
Every mail client has different compatibilities relative to displaying html, css and images. That's why my advice is to use MJML, a framework allowing you to create/design mail templates with a markup language close to html, that will be compiled to respect most compatibility issues on most clients. The output template can either be used to send templated or raw emails with SES.