body {
    font-family: Arial, sans-serif;
    display: flex;
    justify-content: center;
    align-items: center;
    height: 100vh;
    margin: 0;
    background-color: #f0f0f0;
  }
  
  .calculator {
    background-color: rgb(252, 185, 61);
    padding: 20px;
    border-radius: 10px;
    box-shadow: 0 0 10px rgba(0, 0, 0, 0.2);
    width: 300px;

  }
  
  #display {
    width: 100%;
    padding: 10px;
    font-size: 24px;
    text-align: right;
    margin-bottom: 10px;
    border: none;
    background-color:white;
    color: black;
    padding-right: 10px;
    margin-right: 1opx;
  }
  
  .keys {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 10px;
  }
  
  button {
    padding: 15px;
    font-size: 18px;
    text-align: center;
    border: none;
    cursor: pointer;
    background-color: aqua;
    color: black;
    border-radius: 5px;
    transition: background-color 0.3s ease;
  }
  
  button:hover {
    background-color: #555;
  }