.button-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  grid-gap: 15px;
}
#timer-display {
  text-align: center;
  width: fit-content;
}
table {
  font-size: 1.5em;
}
@media (max-width: 900px) {
  .button-grid {
    grid-template-columns: repeat(1, 1fr);
  }
}