It's just the CSS not being applied correctly.
Since clearly you did not write this code, I think you need to contact "chatray" (whoever they are) and ask about it.
If you aren't aware of it, the "bug" is NOT on that "bumblebeechat.net" site, at all.
It's in the <iframe src="http://webchat.chatray.com/chat">.
An optimist sees the glass as half full.
A pessimist sees the glass as half empty.
A realist drinks it no matter how much there is.