#formula {
    font-size: 2.5em;
    padding: auto;
}

/* Reset default margin and padding */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
  }
  
  /* Body styles */
  body {
    font-family: Arial, sans-serif;
    background-color: #f4f4f4;
    color: #333;
    line-height: 1.6;
    margin: 0;
  }
  
  /* Container styles */
  .container {
    max-width: 800px;
    margin: 20px auto;
    padding: 20px;
  }
  
  /* Header styles */
  .header {
    text-align: center;
    margin-bottom: 20px;
  }
  
  /* Form styles */
  .form {
    display: flex;
    flex-wrap: wrap;
    padding: auto;
  }
  
  .form label {
    flex: 1 0 100%;
    margin-bottom: 5px;
    display: block;
    padding: auto;
  }
  
  .form input[type="number"] {
    flex: 1 0 calc(50% - 10px);
    margin-right: 10px;
    padding: 8px;
  }
  
  .form input[type="submit"] {
    flex: 1 0 100%;
    background: #4caf50;
    color: white;
    border: none;
    padding: 10px;
    cursor: pointer;
  }
  
  /* Result styles */
  .result {
    margin-top: 20px;
    padding: 10px;
    background: #e9e9e9;
  }