hide genesis upgraded notice in multisite

[debbieg]

I have a multisite installation running Genesis, with the individual sites using child themes. I don't want the admins and other users of the individual sites to see the Genesis upgraded page when they log in. I take care of all the updates etc on the multisite & this notice is confusing to them. Is there a way I can hide the "Welcome to Genesis" genesis upgraded screen from all users not Super Admin?

[debbieg]

To add more information to my question above:

When non Super Admins log for the first time after an upgrade to Genesis they see the "Welcome to Genesis" genesis upgraded page. I want to hide that page from all except Super Admins.

I have tried doing this with the following must use plugin, but it doesn't work:
<?php

function hide_genesis_updated() {
if ( !is_super_admin() ) { ?>
<style type="text/css">
page=genesis-upgraded {
display: none;
}
</style>
<?php }
}
add_action('network_admin_notices', 'hide_admin_page_genesis-upgraded' );

Any corrections to the above, or alternative solutions would be much appreciated!

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