Originally Posted by sachin
I didn't check is it a serif font or not and i don't know how to check.
Serif fonts have little "hanging bits" on the edges of the letters.
This is a serif font. (Palatino Linotype)
This is a different serif font. (Garamond.)
Sans serif fonts don't. Mobileread's forum is, by default, in a sans serif font.
This is a sans serif font. (Arial)
This is a different sans serif font. (Impact.)
If you add ", serif" to the end of the font family, it means if it can't find that specific font, it'll display in whatever the device's generic serif font is.
Serif fonts are often easier to read on paper and e-ink; sans serif are often easier on LCD/OLED screens. This is because the "hanging bits," which give the eye something to follow on a fixed screen/page, can get blurry at low resolutions, which most computer screens have.
(I have no specific suggestions about the CSS and font embedding; while I've managed it for some ebooks for myself, I think my process is not quite right because it doesn't seem to always work. I'll leave that to people who actually understand what they're doing with it.)