div[id$="thumbs_up"], div[id$="thumbs_down"], div[id$="skip_forward"], div[id$="skip_back"] {
  opacity: .9;
  background: rgba(0,0,0,.6) !important;
  border-radius: 100px !important;
  padding: 2px !important;
  margin: 5px !important;

}
div[id$="thumbs_up"]:hover, div[id$="thumbs_down"]:hover, div[id$="skip_forward"]:hover, div[id$="skip_back"]:hover {
  opacity: 1;
}

.ib-ctrl {
  z-index: 1000;
}