Layer slider not seen on mobiles

Hi, I´ve this web with a layer made for mobiles and a layerslider made for desktop. I´ve added this code in quick css, but on mobiles the images are hidden.
I don´t know what is the problem.
layerslider_4 is for mobles and the layerslider_3 is for destop:

@media only screen and (max-width: 990px) {
.home #layerslider_3 { display: none !important; }
}
@media only screen and (min-width: 990px) {
.home #layerslider_4 { display: none !important; }
}

thanks!