How to make a picture to cover the width of a div : <p>On this <a href="http://rainmakercorp.ch/" rel="nofollow noreferrer">website</a> I would like to fit the picture for the entire div width.
(If you scroll down you'll see the blog section)</p>

<p>As you can see from the <a href="https://i.stack.imgur.com/VYzaV.png" rel="nofollow noreferrer">picture</a> there are some white space on left and right.</p>

<p>How can I achieve this?</p>

<p>Note: I can't edit the HTML structure of the website. I can only work via CSS or JS.</p>

<p>Many many thanks</p>
