.fotorama__fullscreen-icon {
    background: url('../img/bg.png') no-repeat scroll 0 0 rgba(0, 0, 0, 0) !important;
    width: 100% !important;
    height: 100% !important;
    right: 0 !important;
    top: 0 !important;
    z-index: 10 !important;
}