Changing Colour Of Unread Thread

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I'm trying to edit the threadbit template so that in the forum view threads that haven't been yet read show up as green and not blue. I've tried putting in font colour tags in between the strong ones but it doesn't seem to have any effect, can anyone help please?

<if condition="$show['gotonewpost']">
<strong><font color="green"><a href="showthread.php?$session[sessionurl]t=$thread[threadid]$thread[highlight]" id="thread_title_$thread[realthreadid]">$thread[threadtitle]</a></font></strong>
<else />

That's what I have.