Hide Model Windows and button from Mobile

I’m trying to hide the button and Modal window from mobile devices using this code I copied from your Side Menu Button addon but not having much luck. Can you help please.

@media screen and (max-width: 480px) {
.wow_modal_button_left {display:none;}
.wow-modal-id-1 {display:none;}
.wow-modal-botton-1 {display:none;}
}