MediaWiki:Common.css

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/* CSS placed here will be applied to all skins */
.mw-parser-output h3, .mw-parser-output h4 {
  border-bottom-width: 20px !important;
  border-bottom-style: solid !important;
  border-bottom-color: transparent !important;
  border-image-source: url('https://dummyimage.com/88x20/ff00ff/ffffff.png');
  border-image-slice: 0 0 0 0;    /* Ingen cap, hela bilden repeteras */
  border-image-width: 1;
  border-image-repeat: repeat;
  padding-bottom: 0;
}