table {
  border-collapse: collapse;
}
th, td {
  border: 1px solid black;
  padding: 2px;
}

.cell-0 {
  background: #ff0033;
}
.cell-1 {
  background: #d63328;
}
.cell-2 {
  background: #ad661e;
}
.cell-3 {
  background: #849914;
}
.cell-4 {
  background: #5bcc0a;
}
.cell-5 {
  background: #33ff00;
}