It is also easy to switch to a sans-serif default font by using the same font for serif and sans-serif. For example, the userStyle.css:
Code:
@font-face {
font-family: "Arial Black", serif, sans-serif;
font-weight: normal;
font-style: normal;
src: url(res:///adobe/fonts/Arial-Black.ttf);
}
will use Arial Black for any ePub without embedded fonts.