Thank you very much!
I just add'ed the following extra_css (which I borrowed from The New Yorker receipe), but I really can't see any difference on my kindle.
Code:
extra_css = """
body {font-family: "Times New Roman",Times,serif}
.articleauthor{color: #9F9F9F;
font-family: Arial, sans-serif;
font-size: small;
text-transform: uppercase}
.rubric,.dd,h6#credit{color: #CD0021;
font-family: Arial, sans-serif;
font-size: small;
text-transform: uppercase}
.descender:first-letter{display: inline; font-size: xx-large; font-weight: bold}
.dd,h6#credit{color: gray}
.c{display: block}
.caption,h2#articleintro{font-style: italic}
.caption{font-size: small}
"""