User:Wsargent/monobook.css

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/* hide the logo */
#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)
*/
#p-logo a:after {
  position:absolute; top:0; left:0; height: 155px; width: 12.2em;
  background: url(https://www.noisebridge.net/images/3/3a/Nb-walmart-150.png) no-repeat 35% 50%;
  text-decoration: none;
  content:' '; /* to make the element actually appear */
}