How to hide your social share buttons on a mobile device

[dusdatja]

I use the simple social share buttons plugin on my Genesis website. Like Brian Gardner I want them to hide when using a mobile device. On Twitter he told me to add:

.YOURDIVNAME_HERE { display: none; }

under

@media only screen and (max-width: 600px) {

But the thing is, I can't get it to work. I tried

.really_simple_share,
	#content {
		display: none;
	}

And

.really_simple_share
	 {
		display: none;
	}

But they both don't work. Sorry, I'am no css guru :). Anyone know's how to fix this? Post example: http://dusdatja.nl/verslag-thom-076/