/* hidden on default */
div#mobilenote { display: none; }

/* use a media query to filter small devices */
@media only screen and (max-width:480px), only screen and (max-device-width:780px) {
     
    /* mobile banner on top */
    div#mobilenote { 
		display: block; 
		font-size:5em;
		background:#ffcc00;
		color: #663399;
		text-align:center;
		width:100%;
	}
	
}