User talk:Aestetix/monobook.css

/* hide the logo */

1. p-logo a, #p-logo a:hover { background-position:-200px 0px !important; }

/* style a:after pseudo-element, based on monobook's #p-logo style,

  to contain a replacement logo. (It is necessary to do it this convoluted way
  because the original background url is specified in the html style attribute)

• /

1. p-logo a:after {

 position:absolute; top:0; left:0; height: 155px; width: 12.2em;
 background: url(https://www.noisebridge.net/images/d/d0/Hello.png) no-repeat 35% 50%;
 text-decoration: none;
 content:' '; /* to make the element actually appear */

}