CSS for ebook should deal in relative dimensions. NEVER cm or in
1.2em means 1.2 * the width of an M in the current font (face and size)
6em is huge. (for normal paragraphs, I use 1.2 - 2em as an indent)
If you want a List, the use <UL> <--unordered list
and <LI> for each item
Note ALL tags get closed
</li>
And finally </ul> to end list mode

Find some books close to the type you are doing in the MR Library, and look at how the are coded