MediaWiki:Common.css

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/* CSS placed here will be applied to all skins */
/* Clearfix for infobox tables */
.clearfix::after {
  content: "";
  display: table;
  clear: both;
}

/* Section heading underline */
h2, h3, h4, h5, h6 {
    border-bottom: 1px solid #ccc;
    padding-bottom: 0.3em;
    margin-bottom: 0.5em;
}