How to make a button that can change background color of a doucment?

Tags: javascript,html,css

Problem :

I would like to make a button that when it's clicked ,the background color of my webpage changes. I have tried already with Javascript & Css but no success! Here's my code:

<!DOCTYPE html>
        <script type="text/javascript">

    <body class="bgcolor1">
        <button onclick="this.className = 'bgcolor2'">Change COLOUR</button>

As you can see when the user click on the button it should change the class to "bgcolor2" so the background color would be grey but it just changes the background color of the button to grey & not the document! So how can I change the background color of document with css or js or what's the problem with this code? thx ...

Solution :

<button onclick="document.body.className = 'bgcolor2'">Change COLOUR</button>

this refers to the button and not the body. document.body.className = 'bgcolor2';

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