body {
    display: grid;
    justify-content: center;
    align-items: center;
    height: 100vh;
    width: 100%;
    background-color: skyblue;
    background-image: url('./images/backimg.jpg');
  }
  
  .calculator {
    margin-left: 120px;
    background-color: yellow;
    border-radius: 10%;
    padding: 20px;
    box-shadow: 10px 10px 10px 10px rgba(83, 111, 223, 0.806);
    width: 250px;
    border: red;
    border-style:dashed;
    border-width: 10px;
    animation: pulsateBorder 2s infinite;
  }

  @keyframes pulsateBorder {
    0% {
      border-color: red;
      background-color: lightseagreen;
    }
    50% {
        border-color: black;
        background-color: lightcoral;
      }
    100% {
          border-color: black;
          background-color: lightskyblue;
        }  
  }
  
  #result {
    width: 90%;
    margin-bottom: 10px;
    padding: 10px;
    font-size: 18px;
    background-color: skyblue;
    font-weight: boldx;
    margin-top: 10%;
    margin-bottom: 10%;
    border-radius: 10px;
  }
  
  .keypad {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    grid-gap: 5px;
  }
  
  button {
    padding: 10px;
    font-size: 18px;
    font-weight: bold;
    background-color: black;
    color: white;
    border-radius: 100%;
    cursor: pointer;
    box-shadow: 2px 2px 2px 2px rgba(83, 111, 223, 0.806);
  }
  button:hover {
    background-color: blue;
    color: white;
  }
  .resetBtn{
    color: red;
    font-weight: bold;
  }
  .delBtn{
    color: yellow;
    font-weight: bold;
  }
 .opBtn {
    color: blue;
    font-weight: bold;
 }
 footer{
    display: flex;
    justify-content: center;
    text-align: center;
    width: 100%;
    background-color: bisque;
    font-size: 20px;
    animation: pulsateBorder 2s infinite;
    font-weight: bold;
 }