.cancel-block {
  font-family: monospace;
  margin-bottom: 1em;
  padding: 0.5em;
  background: #f5f5f5;
  border-radius: 4px;
  animation: fadeIn 1s ease;
}
.number-sequence {
  font-weight: bold;
  font-size: 1.5em;
}
.math {
  color: #444;
  margin-top: 0.3em;
  font-size: 1em;
}
@keyframes fadeIn {
  from { opacity: 0; transform: translateY(5px); }
  to { opacity: 1; transform: translateY(0); }
}