When I am trying to apply different CSS properties on col tags in HTML, to have different styling to one Table Column, its not working. Only "background-color" is working. color, width, font-style CSS properties not working on columns. 

```
<!DOCTYPE html>
<html>
<head>
<style>
table, th, td {
    border: 1px solid black;
}

#col-1{

    background-color: blue;
    color: white;   
    width: 50px;
    font-style: italic;
}

</style>
</head>
<body>

<table>
  <colgroup>
    <col id="col-1">
    <col id="col-2">
    <col id="col-3">
  </colgroup>
  <tr>
    <th>ISBN</th>
    <th>Title</th>
    <th>Price</th>
  </tr>
  <tr>
    <td>3476896</td>
    <td>My first HTML</td>
    <td>$53</td>
  </tr>
  <tr>
    <td>5869207</td>
    <td>My first CSS</td>
    <td>$49</td>
  </tr>
</table>

</body>
</html>

```