styles.css

body {
    margin: 0;
    padding: 0;
    background-image: url('calculator.jpg');
    background-size: cover;
    font-family: Arial, sans-serif;
  }
  
  .calculator {
    width: 300px;
    margin: 100px auto;
    padding: 20px;
    background-color: black;
    box-shadow: 0cap;
    border-radius: 10px;
    box-shadow: 0 5px 15px rgba(24, 10, 10, 0.3); /* Added shadow for 3D effect */
  }
  
  #display {
    width: calc(100% - 20px);
    padding: 10px;
    margin-bottom: 10px;
    font-size: 24px;
    border: none;
    background-color: rgba(65, 64, 64, 0.9);
    border-radius: 5px;
    box-shadow: inset 0 0 5px rgba(0, 0, 0, 0.2);
  }
  
  .buttons {
    display: grid;
    box-shadow: 0cqh;
    grid-template-columns: repeat(4, 1fr);
    grid-gap: 5px;
  }
  
  button {
    padding: 20px;
    font-size: 18px;
    background-color: rgba(255, 255, 255, 0.9);
    border: none;
    border-radius: 5px;
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.3); /* Added shadow for 3D effect */
    cursor: pointer;
  }
  
  button:hover {
    background-color: rgba(255, 255, 255, 0.7);
  }
  
  .operator {
    background-color: rgba(0, 128, 255, 0.9);
    color: white;
  }
  
  .operator:hover {
    background-color: rgba(0, 128, 255, 0.7);
  }
  
  button.delete {
    background-color: rgba(255, 0, 0, 0.9);
    color: white;
  }
  
  button.delete:hover {
    background-color: rgba(255, 0, 0, 0.7);
  }