Floating Social Plugin: Can I center the Facebook and Twitter icons (count and buttons) ?

Hi I have installed the Floating Social plugin and have configured it to display Facebook and Twitter on posts. I have also made minor adjustments to the width of the container to better display the Twitter button and to the spacing between the Facebook and Twitter elements to prevent things looking cramped. All that seems to have worked OK. Here is the CSS I have in place:

#wdsb-share-box {
width: 70px;
}
#wdsb-service-facebook {
margin-bottom:10px;
}

Currently the Facebook and Twitter elements appear left-aligned. Is there a way of centering them within the container? I've been using Firebug to try and isolate the relevant items to target but haven't been able to.

A sample post where you will be able to see what's going on is here:

http://www.riotstories.co.uk/wordpress/featuredpostsslider/

Thanks for any help