.nav__element_opener {
  display: block;
  height: 48px;
  padding: 0 !important;
  position: absolute;
  right: 15px;
  top: 0;
  width: 40px;
  z-index: 999;
}

.nav__element_opener_icon {display:block;top:22px;left:15px;position:absolute;text-indent:-999em;width:10px;height:10px; }
.nav__element_opener:not(.open):hover .nav__element_opener_icon { background-position:0 -10px; }
.open .nav__element_opener_icon { background-position:0 -20px; }