style.css

body {
    background-color: #f2f2f2;
    font-family: Arial, sans-serif;
    margin: 0;
    padding: 0;
  }
  
  .container {
    max-width: 400px;
    margin: 50px auto;
    padding: 20px;
    background-color: #fff;
    border-radius: 5px;
    box-shadow: 0 2px 5px rgba(0, 0, 0, 0.1);
    text-align: center;
  }
  
  h1 {
    color: #333;
  }
  
  .input-container {
    margin-bottom: 10px;
    text-align: left;
  }
  
  input[type="number"] {
    width: 100%;
    padding: 10px;
    border: 1px solid #ccc;
    border-radius: 5px;
    box-sizing: border-box;
  }
  
  button {
    background-color: #4caf50;
    color: #fff;
    border: none;
    padding: 10px 20px;
    border-radius: 5px;
    cursor: pointer;
  }
  
  #result {
    margin-top: 20px;
    font-weight: bold;
  }