I am using hexchat with Ubuntu gnome DarkTheme (included with stock)
I do not understand the color preferences and cannot get anything that is useful, perhaps because of the global dark theme. Hexchat has a preference screen that looks like this and here is no doc on it.
I loaded some themes but it seems that the text box background for entering text is white and the foreground text color is grey on many themes (3 so far). So where is the texbox background (where you type your message).?