Collapsible top margin - how to remove?

Collapsible top margin - how to remove?

Hi,
 
With the html below, I get a space between the page footer and the collapsible, about half a height of one collapsible item, how can I get rid of that space? If I replace collapsible with listview it start right after page footer and there's no space.
 
Thanks!
 
        <div data-role="content">
            <div data-role="collapsible-set" data-inset="false">
                <div data-role="collapsible">
                    <h3>1</h3>
                </div>
                <div data-role="collapsible">
                    <h3>2</h3>
                </div>
                <div data-role="collapsible">
                    <h3>3</h3>
                </div>
            </div>
        </div>