In chat, when you upload pictures, the "upload button" does not have a hover effect like the "upload" and "cancel" buttons do. Here is what I mean:
However, with the other buttons, they have a press-down effect:
I'm guessing this is a bug with the css?
Firefox, Ubuntu 14.04.2LTS
Chrome, Also Ubuntu 14.04.2LTS
Note: This is just hovering over the button, not pressing it
Another note: The upload button does not have a press mouse, but the cancel button does. Its just that my screenshot tool can't capture that.