.hoverbox {
     position:absolute;
     top:0;
     left:0;
     -webkit-transition: all 0.7s ease;
     transition: all 0.7s ease;
     width:100%;
     height: 100%;
}


@media (max-width: 740px){
     .hoverbox:hover {
          background: rgba(47,41,39,0.75) url(../../../images/frontend/2/plus-xs.png) center center no-repeat;
     }
}
@media (min-width: 741px){
     .hoverbox:hover {
          background: rgba(47,41,39,0.75) url(../../../images/frontend/2/plus-sm.png) center center no-repeat;
     }
}