body {
  font-family: sans-serif;
  text-align: center;
  background-color: #111;
  color: white;
}
.keyboard {
  display: inline-block;
  margin-top: 40px;
  background: #232323;
  padding: 30px 20px;
  border-radius: 18px;
  box-shadow: 0 0 16px rgba(0,0,0,0.5);
}
.row {
  display: flex;
  justify-content: center;
  margin-bottom: 10px;
}
.key {
  background-color: #444;
  padding: 18px 18px;
  margin: 3px;
  border-radius: 8px;
  font-size: 22px;
  cursor: pointer;
  transition: transform 0.1s, background-color 0.2s;
  user-select: none;
  min-width: 36px;
  text-align: center;
}
.key.active {
  background-color: #88f;
  transform: scale(1.08);
  color: #fff;
  box-shadow: 0 0 7px #88f;
}
@media (max-width: 700px) {
  .keyboard { padding: 10px 2px; }
  .key { padding: 12px 4px; font-size: 17px; min-width: 24px;}
}