repeat a tiled background in enfold layer slider

Hi,

I have an img for the layer slider background that needs to be tiled, how can I do that with css?
I’ve tried this:

img.ls-bg.ls-preloaded {
background-repeat: repeat !important;
}
and this:

img.ls-bg.ls-preloaded {
background-image: url(“http://www.sundaradesign.com.au/wp-content/uploads/2014/09/symphony2.jpg”);
}

but the image just shows stretched over the full background and doesn’t repeat.
Thanks for your help,
Lisa