If you send an EPUB with <fieldset> tags that put boxes around text through Send to Kindle, those boxes won't render.
Most EPUB readers add default CSS to fieldset tags.
https://www.w3schools.com/tags/tag_fieldset.asp
But apparently Send to Kindle KFX is not one of them.
So you need to add this CSS manually.
Calibre convert to EPUB:
Look & Feel: Styling: Extra CSS
Code:
.system {
display: block;
margin-left: 2px;
margin-right: 2px;
padding-top: 0.35em;
padding-bottom: 0.625em;
padding-left: 0.75em;
padding-right: 0.75em;
border: 2px groove;
}
img {
height: auto !important;
width: auto !important;
max-width: 100%;
display: block;
}
Look & Feel: Transform HTML
If the tag is fieldset
change tag name span
add classes system
Page Setup: Output Profile: Tablet (at the bottom)
Epub Output: EPUB VERSION 3!!
then upload via Send to Kindle website.
Send to Kindle ignores <fieldset> default css that adds boxes and margins around text, so I convert the <fieldset> to <span> and add the missing css manually. system is just a name, I could have called it `anything`
video version:
https://www.youtube.com/watch?v=-BdsTClSvD4