MediaWiki: Tweeki.css

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.table {
  width: auto;
  height: auto;
  max-width: 100vw;
  max-height: 100vh;
  overflow: auto;
  position: relative;
  display: inline-block;
}

.table table {
  position: relative;
  border-collapse: collapse;
  margin: 0;
}

td,
th {
  padding: 0.25em;
}

tr:first-child th {
  position: -webkit-sticky; /* for Safari */
  position: sticky;
  top: 0;
  background: #000;
  color: #FFF;
}

tr:nth-child(n+2) th {
  position: -webkit-sticky; /* for Safari */
  position: sticky;
  left: 0;
  background: #FFF;
  border-right: 1px solid #CCC;
}

tr th:first-child {
  left: 0;
  z-index: 1;
}