input {
  width: 2em;
  text-align: center;
}

.matched {
  background: lightgreen;
}

table {
  border: thin solid;
}

#cases {
display: flex;
flex-direction: column;
gap: 2lh;
}

:is(.extra-row, .missing-column) input {
  background: hsl(0,50%,90%);
}