Announcement box in Chatbox

Hi  
i have one question how to add Announcement in Chatbox
Like This :



For Phpbb2 Version & Thanks   
I need the code as any way !

Try adding this to your CSS:

Code:

div#chatbox:after {
  content:'ANNOUNCEMENT MESSAGE HERE';
  background: url('http://cdn3.iconfinder.com/data/icons/fatcow/32x32_0400/error.png') no-repeat 6px rgba(0,0,0,0);
  border: 1px solid green;
  color: green;
  padding: 6px 6px 6px 40px;
  box-shadow: 0 0 0 1px rgba(255, 255, 255, 0.2) inset;
  border-radius: 3px 3px 3px 3px;
  display: block;
  font-size: 12px;
  padding: 10px;
  padding-left: 40px;
  font-family:Verdana;
}

Change

content:'ANNOUNCEMENT MESSAGE HERE';

to your announcement message, and

background: url('http://cdn3.iconfinder.com/data/icons/fatcow/32x32_0400/error.png') no-repeat 6px rgba(0,0,0,0);

to your preferred icon and background color.

workiNg Thanks