Better default epub.css for Pandoc (tested with iBooks)

epub.css

/* This defines styles and classes used in the book */
body { margin: 0; text-align: justify; font-size: medium; font-family: Athelas, Georgia, serif; }
code { font-family: monospace; }
h1 { text-align: left; }
h2 { text-align: left; }
h3 { text-align: left; }
h4 { text-align: left; }
h5 { text-align: left; }
h6 { text-align: left; }
h1.title { }
h2.author { }
h3.date { }
ol.toc { padding: 0; margin-left: 1em; }
ol.toc li { list-style-type: none; margin: 0; padding: 0; }

/*  Disable hyphenation for headings to avoid single-syllable-lines.
*/
h1,
h2 {
	  -epub-hyphens: none;
  -webkit-hyphens: none;
     -moz-hyphens: none;
          hyphens: none;
}

/* Set the minimum amount of lines to show up on a separate page. (There is not much support for this at the moment.)
*/
p,
blockquote {
  orphans: 2;
  widows: 2;
}

/*  Turn on hyphenation for paragraphs and captions only.
*/
p,
figcaption {
	  -epub-hyphens: auto;
  -webkit-hyphens: auto;
     -moz-hyphens: auto;
          hyphens: auto;
}

/*  Shortcodes for page-break rules.
    Use data attributes to designate if and how the page should be broken before, inside or after an element.
*/
h1, h2, h3, h4, h5, h6,
table, img, figure, video,
[data-page-break~=inside][data-page-break~=avoid] { page-break-inside:  avoid; }
[data-page-break~=after]                          { page-break-after:  always; }
h1, h2, h3, h4, h5, h6,
[data-page-break~=after][data-page-break~=avoid]  { page-break-after:   avoid; }
[data-page-break~=before]                         { page-break-before: always; }
[data-page-break~=before][data-page-break~=avoid] { page-break-before:  avoid; }
img[data-page-break~=before]                      { page-break-before:   left; }