prevent scroll when showing popover
Hi,

here is my code:

`<a href="#popover" id="popoverLink" >
        <h1 class="title"> Header Title 
        </h1>
</a>
<div id="popover" class="popover">
    <header class="bar bar-nav">
        <h1 class="title">Menu</h1>
    </header>
    ...
</div>`

I noticed that when I click on a `#popover` I can see the view scrolling down a little.
I need to prevent this behaviour because I have an event listener on window scrolling and I don't want popover to make view to scroll when user click on it.

Is it possible to do that?

Thanks
