.keypad {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 10px;
  margin-bottom: 15px;
}

.keypad button, .submit-button {
  padding: 20px;
  font-size: 18px;
  cursor: pointer;
  background-color: #333;
  color: #fff;
  border: none;
  border-radius: 5px;
}

.keypad #buttonBackspace {
  background-color: #E53835;
}

.keypad button:hover, .submit-button:hover {
  background-color: #555;
}

.keypad-input {
  padding-left: 120px;
  padding-right: 120px;
}