I see that the default email width on the AcyMailing editor is 580px. That's ok in itself, but the width really does need to scale. Most mobile phones are less than 580px wide and a desktop email client often shows a comfortable viewing size of more than 580px.
I do think 580px is a reasonable size for most use cases, but there does need to be a bit of adjustment. As things are, it seems to me that the adjustment is handled by scaling the font size down for mobile, rather than adjusting the width of the email. This results in a very small font — too small. And if the size is enlarged on the phone, then the width gets bigger than the phone's width, meaning that one has to shift the email horizontally to read it.
The usual html/css way of dealing with this is to use CSS settings — something like:
width: 100%;
max-width: 650px;
Is there any way to set this up in AcyMailing? Perhaps with CSS? If so, what are the CSS selectors that one should use?