.sr-only:not(:focus):not(:active) {
  clip: rect(0 0 0 0);
  clip-path: inset(50%);
  height: 1px;
  overflow: hidden;
  position: absolute;
  white-space: nowrap;
  width: 1px;
}

.grid {
  position: absolute;
  inset: 0;
  overflow: hidden;
  border: 1px solid #ccc;
}

.cell {
  border: 1px solid #444;
  margin: 1px;
  padding: .3rem;
}