css.css

body {
    font-family: Arial, sans-serif;
    background-color: #f5f5f5;
    margin-top: 150px;
  }

  .container {
    max-width: 400px;
    margin: 0 auto;
    padding: 20px;
    background-color: #fff;
    border-radius: 5px;
    box-shadow: 0 2px 5px rgba(0, 0, 0, 0.1);
  }

  h1 {
    text-align: center;
    margin-top: 0;
    font-size: 35px;
  }

  .input-group {
    margin-bottom: 20px;
  }

  .input-group label {
    display: block;
    margin-bottom: 5px;
    font-size: 25px;
  }

  .input-group input {
    width: 94%;
    padding: 10px;
    font-size: 20px;
    border-radius: 10px;
    border: 4px solid #ccc;
  }

  .btn {
    display: flex;
    width: 80%;
    padding: 10px;
    font-size: 16px;
    background-color: #4CAF50;
    color: #fff;
    border: none;
    border-radius: 5px;
    margin: 10px 45px;
    cursor: pointer;
    justify-content: center;
  }

  .result {
    font-size: 18px;
    font-weight: bold;
    margin-top: 20px;
    text-align: center;
  }