Short HTML email extending limitlessly when shown in preview window

Hi @zendall, 

Thanks for sharing this to the Community. It’s definitely an interesting/tricky one since it is just the previewer that is having issues and not the actual email send. Without being able to look at your code, it’s possible that this result means that your code for this template is reacting to Klaviyo's 'back end' previewing. Have you taken a look to see that your CSS measurements are clearly defined - as in, does your HTML have width: 600px, as suggested in this article for Optimal Email Template Width?

Additionally, or alternatively, you might want to look into adding in Viewport CSS if that’s not something you are currently using. More details on that here: 
https://www.w3schools.com/css/css_rwd_viewport.asp

The Viewport might be more applicable towards device variation, rather than your original point about Edision Mail (I’m not familiar with that ESP unfortunately, so I can’t say for sure), but it might be helpful to look into these two options first. 

-Cass.