MediaWiki: Tweeki.css

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.test {
  text-align: left;
  position: relative;
  border-collapse: collapse; 
}
.test th, td {
  padding: 0.25rem;
}
.test tr:first-child {
  background: red;
  color: white;
}
.test th {
  background: white;
  position: sticky;
  top: 0; /* Don't forget this, required for the stickiness */
  box-shadow: 0 2px 2px -1px rgba(0, 0, 0, 0.4);
}