I want to apply css only to the text. I have this code:

```
<div id='post-body'>
Lorem ipsum dolor set
<img src='any URL'>
</div>

```

And [this picture](http://i.stack.imgur.com/2XYfe.png) shows how I want it to look like

There should be a padding to text only and the image should have full width.

Is there any way to do that using javascript or jquery?