Howdy all!
I have been getting an issue that seems to be pretty common, namely when I convert my epub volumes to mobi I get an excessively large left-margin.
With the help of Sigil and by searching several threads on this forum, I think I have tracked down the issue to changes Calibre makes to the CSS upon conversion; the margin-left spacing is defined across both the parent and child elements that comprise the same paragraph, thus causing the extra padding.
I know Calibre allows for defining custom CSS to be added as part of the conversion process, and I have manually tested and confirmed that by adding the property 'blockquote {margin-left: 0 !important;}' the extra margin spaces are cancelled out, and the issue is fixed. Voila! Problem is, it only works when I manually put in the code using Sigil. When I use Calibre to insert the code, it simply ignores the additional CSS I have defined and never adds it.

Am I making a noob mistake somewhere?
I ask because I have quite a number of ePub files I would like to plop on my Kindle, and the idea of cracking open every single one in Sigil seems very... unfortunate

Particularly when it seems like Calibre can easily fix this as part of its conversion process.
Thanks for any help or advice anyone can provide!