* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

.table thead th {
  background-color: black; /* Header background color */
  color: white; /* Header text color */
}

th:first-child,
td:first-child {
  position: -webkit-sticky;
  position: sticky;
  left: 0px;
}