.sieve {
  border-collapse: collapse;
  background-color:light-dark(#ffffe0,#202020);
  border:1px solid black;
  padding:8px;
  margin:8px;
  overflow:auto;
  max-width:99%;
}

.sieve_cell {
  width:24px;
  text-align:right;
  border:1px solid black;
  background-color:light-dark(#e0ffe0,#202020);
  padding:2px;
}