Responsive Email Design is a guide on how to design and code mobile-friendly email campaigns. Now that mobile email usage exceeds desktop and webmail, providing a great small screen experience is essential.
Or just putting width: 0px; height: 0px; background: none transparent; may do the trick. Not if email clients do not yet support responsiveness in designs, like the whole concept of @media queries… But as a workaround for this problem, it may still be a viable option.
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Another great way of putting it in more specific terms: