.container {
  background-color: var(--background);
  display: flex;
  justify-content: center;
  align-items: center;
  height: 100vh;
}

.container .calculator {
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  padding: 2rem;
  background-color: var(--calculator-background);
  box-shadow: 0 0 1rem var(--box-shadow);
  border-radius: 1rem;
  width: 30rem;
}

.calculator .display {
  width: 100%;
  padding: 1rem;
  margin-bottom: 1rem;
  font-size: 3rem;
  text-align: right;
  border: none;
  border-radius: 0.5rem;
  box-shadow: 0 0 1rem var(--box-shadow);
}

.calculator .buttons {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1rem;
}

.calculator .buttons button {
  padding: 1rem;
  font-size: 2rem;
  border: none;
  border-radius: 0.5rem;
  box-shadow: 0 0 1rem var(--box-shadow);
  cursor: pointer;
  transition: background-color 0.3s;
}

.calculator .buttons button:hover {
  background-color: var(--button-hover);
}

.calculator .buttons button:active {
  transform: scale(0.95);
}

.calculator .buttons .special-char {
  color: var(--special-char);
}