JJField on "Responsive Theme - Close Gap not working"

http://www.a1-designs.co.uk
Hello,

I am trying to close the gap between the social icons and the bottom of the page content, of which there is aprox 60px to close. I have used the following CSS but further increments wont have any effect? Can someone help?

#footer-wrapper {
margin: 0;
padding: 0px;
margin-top: -20px;
}