.keyboard {
  height: 200px;
  margin: 0 auto;
  position: sticky;
  bottom: 0;
  max-width: 500px;
  background-color: var(--background);
}
.keyboard:not(.extended) > div:first-child {
  display: none;
}
/* Row */
.keyboard-row {
  display: flex;
  width: 100%;
  margin: 0 auto 8px;
  touch-action: manipulation;
}
.keyboard button {
  font-size: 1.25em;
  font-weight: bold;
  border: 0;
  padding: 0;
  margin: 0 6px 0 0;
  height: 58px;
  border-radius: 4px;
  cursor: pointer;
  background-color: #818384;
  color: #f8f8f8;
  flex: 1;
  display: flex;
  justify-content: center;
  align-items: center;
  text-transform: uppercase;
  line-height: 1.15;
}
.keyboard button.active {
  background-color: rgb(139, 0, 0);
}
.keyboard-row button:last-child {
  margin: 0;
}
.keyboard button:disabled {
  background-color: rgba(87, 112, 122, 0.44);
  color: rgba(0, 0, 0, 0.35);
  cursor: not-allowed;
}
.keyboard .spacer {
  flex: 0.5;
}
.keyboard [data-key^="Arrow"] {
  font-size: 3em;
}