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<!DOCTYPE html>
<html>
<head>
<style>
table, th, td {
  border: 1px solid black;
}
</style>
</head>
<body>
<table>
  <colgroup>
    <col id="myCol">
    <col style="background-color:yellow">
  </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>
<p>Click the button to set the background color of the first two columns to red.</p>
<p id="demo"></p>
<button onclick="myFunction()">Try it</button>
<script>
function myFunction() {
  document.getElementById("myCol").span = "2";
  document.getElementById("myCol").style.backgroundColor = "red";
}
</script>