change width of message box

Posted by lavoice on Jun 08, 2012; 8:48pm
URL: https://support.nabble.com/change-width-of-message-box-tp7580275.html

I've been messing around with the css for a while now and cant figure out how to limit the width of the text box. Need it to be 300px so that it fits a mobile screen. Help please?