.nav ul li span{position:absolute; z-index:1; right:0; top:0; height:30px; display:block; width:30px; text-align:center; cursor:pointer; display:none; background:url(../images/plus-icon.png) no-repeat center center, rgba(0,0,0,0.2);}
@media only screen and (max-width:767px){
	.nav ul li span{display:block;}
	}