First icon is raised

Hi,

thanks for this very cool plugin.

I’ve got only one issue which I can’t solve.
The first icon in the row is raised by 9px and I have no idea why.

It’s on http://raja-video-challenge.de/ -> footer.

Many greetings,

Simon

http://ww.wp.xz.cn/extend/plugins/brankic-social-media-widget/