.numeric-keyboard {
  width: 100%;
  max-width: 300px;
  margin: 0 auto;
}

.display {
  background-color: #f0f0f0;
  padding: 10px;
  text-align: right;
  font-size: 24px;
  margin-bottom: 10px;
}

.keypad {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 10px;
}

button {
  padding: 15px;
  font-size: 20px;
  border: none;
  background-color: #e0e0e0;
  cursor: pointer;
}

button:active {
  background-color: #d0d0d0;
}