.calculator-container {
  display: grid;
  grid-template-rows: auto 1fr;
  gap: 10px;
  width: 300px;
  margin: 50px auto;
  padding: 20px;
  border: 1px solid #ccc;
  border-radius: 8px;
  box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
  background-color: #f9f9f9;
}

.display {
  margin-bottom: 10px;
}

.display input {
  width: 100%;
  height: 50px;
  font-size: 2em;
  text-align: right;
  padding: 0 10px;
  border: 1px solid #eee;
  border-radius: 4px;
  background-color: #e9e9e9;
}

.buttons {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 10px;
}

.clr-btn {
  height: 60px;
  font-size: 1.5em;
  display: flex;
  justify-content: center;
  align-items: center;
}

.zero-btn {
  grid-column: span 2;
}

.equals-btn {
  grid-row: span 2;
  height: 100%;
}
