Position:sticky for table headers

.table-wrapper {
  max-width: 700px;
  overflow: scroll;
}

table {
  position: relative;
  border: 1px solid #ddd;
  border-collapse: collapse;
}

td, th {
  white-space: nowrap;
  border: 1px solid #ddd;
  padding: 20px;
  text-align: center;
}

// The heading of our table
th {
  background-color: #eee;
  position: sticky;
  top: -1px;
  z-index: 2;
  
  // The first cell that lives in the top left of our spreadsheet
  &:first-of-type {
    left: 0;
    z-index: 3;
  }
}

// The first column that we want to stick to the left
tbody tr td:first-of-type {
  background-color: #eee;
  position: sticky;
  left: -1px;
  z-index: 1;
}