[Krytes]

I have an epub with a lot of links that I don't want to look like links. I tried to change the style of the <a> tag by putting <style>a {color: black; text-decoration: none}</style> in the head of the xhtml file, which works fine in other epub readers, but not in Kobo's reader - it still displays the links in grey, underlined style.
Is there a way to change Kobo's default link style, or to force it to follow the style in my epub?