User:Dubaduba~enwiki/cologneblue.css

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The accompanying .js page for this skin can be added at User:Dubaduba~enwiki/cologneblue.js.

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/* start tooltip code  */

div.info {
  z-index:24;                      /*required */
  position:relative;               /*required */
  background-color:yellow;         /*use any color you like */
  cursor:help                      /*optional, or use another cursor */
}

div.info:hover {
  z-index:25;                      /*required */
  background-color:pink            /*use any color you like */
}

div.info:hover div.urlexpansion {
  display:block;                   /*required */
  position:absolute;               /*required */
       /*border and size specifications, change as you like */
  top:2em;
  left:2em;
  width:15em;
       /* colors, change as you like */
  border:1px solid #0cf;
  background-color:#cff;
  color:#000;
}

/* end tooltip code  */