Of course in the world of responsive images, we put constraints on our images with CSS:img { max-width: 100%;}Now the image appears at it’s natural size unless it’s constrained by the parent container! Excellent.

However, as powerful as the <picture> element is, sometimes it gives us more power than is actually needed to achieve suitable responsiveness. Sometimes all it really takes is a regular <img> element using the srcset and sizes attributes inline.

If you're trying to use flexbox as a responsive way to adapt your mails in different devices, well there's a framework for that called MJML hope it works for you.

Components are the core of MJML. A component is an abstraction of a more complex email-responsive HTML layout. It exposes attributes, enabling you to interact with the final component visual aspect.

MJML has been designed with responsiveness in mind. The abstraction it offers guarantee you to always be up-to-date with the industry practices and responsive. Email clients update their specs and requirements regularly, but we geek about that stuff - we’ll stay on top of it so you can spend less time reading up on latest email client updates and more time designing beautiful email.

This is responsive, but you can use media queries to specify different sizes and margins for mobile if necessary.

Layouts uses the Bootstrap framework, so everything you build with it is responsive. Sites that you build with Layouts display great on desktops, tablets and phones. The Bootstrap grid will shift and adjust automatically according to the screen size. Layouts gives you additional control over the exact appearance in every width. You can manually select how the grid will appear, to get perfect positioning on every device. You can even completely hide parts of the page if you don’t want them to appear on narrow screens.

Your exported Hype document should be 1024 width × 648 height or smaller.