MediaWiki: Tweeki.css

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

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

td,
th {
  padding: 0.25em;
  width: auto;
  text-align: center;
}

td {
    z-index: -2;
    position: relative;
}

tr:nth-child(n+2) th {
  position: -webkit-sticky; /* for Safari */
  position: sticky;
  left: 0;
  background: #FFF;
  z-index: -1;
}

tr:nth-child(n+2) th span {
  display: block;
  height: 100%;
  width: 1px;
  position: absolute;
  top: 0;
  right: 0;
  background: #CCC;
}

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

tr:nth-child(n+2) td:first-child {
  border-left: 1px solid #CCC;
}