style.css

* {
    box-sizing: border-box;
  }
  
  body {
    font-family: Arial, sans-serif;
    margin: 0;
    /* background-color: black; */
  }
  .hidden {
    display: none;
    }
  h1, h4 {
    text-align: center;
    /* color: white; */
  }
  
  form {
    margin: 20px auto;
    max-width: 500px;
    padding: 20px;
    background-color: #f2f2f2;
    border-radius: 5px;
  }
  
  label {
    display: block;
    margin-bottom: 5px;
  }
  
  input[type="text"],
  input[type="number"], select {
    width: 100%;
    padding: 12px;
    margin-bottom: 20px;
    border: none;
    border-radius: 4px;
    background-color: #fff;
    font-size: 16px;
  }
  
  input[type="submit"] {
    background-color: #4CAF50;
    color: #fff;
    padding: 12px 20px;
    border: none;
    border-radius: 4px;
    cursor: pointer;
    font-size: 16px;
  }
  
  button[type="button"]:hover {
    background-color: #45a049;
  }
  
  #result {
    margin-top: 20px;
    overflow-x:auto;
    display: none;
  }
  table {
    border-collapse: collapse;
    margin-top: 20px;
    width: 100%;
  }
  th, td {
    border: 1px solid #ddd;
    padding: 8px;
    text-align: left;
  }
  th {
    background-color: #008CBA;
    color: #fff;
  }