@zhsz/cool-design-dv/es/packages/dv-web-rtc-player/style.css

/* BEM support Func
 -------------------------- */
/* Break-points
 -------------------------- */
/* Scrollbar
 -------------------------- */
/* Placeholder
 -------------------------- */
/* BEM
 -------------------------- */
.my-webrtcPlayer {
  width: 100%;
  height: 100%;
  background-color: rgba(0, 0, 0, 0.3);
  position: relative;
  line-height: 0;
}
.my-webrtcPlayer__error {
  position: absolute;
  top: 50%;
  left: 50%;
  color: red;
  transform: translate(-50%, -50%);
}

.my-webrtcPlayer__fullscreen {
  transition: opacity 0.1s;
  position: absolute;
  z-index: 9999;
  line-height: 0;
  top: 10px;
  right: 10px;
  background: rgba(0, 0, 0, 0.3);
  padding: 4px;
  border-radius: 3px;
  color: rgba(255, 255, 255, 0.4);
  opacity: 0;
  cursor: pointer;
  display: block;
  align-items: center;
  justify-content: center;
}

.my-webrtcPlayer:hover .my-webrtcPlayer__fullscreen {
  opacity: 1;
}