body {
  margin: 0;
}

#app,
#app div {
  display: flex;
  height: 100vh;
  width: 100%;
}

#app img {
  width: 100%;
  height: auto;
  max-height: 100vh;
  z-index: 0;
  align-self: center;
}

#app video {
  height: 100vh;
  margin: 0 auto;
  display: block;
}

#app .floatBtn {
  display: block;
  width: 40px;
  height: 32px;
  border-radius: 50%;
  background-color: rgba(0, 0, 0, .3);
  color: white;
  z-index: 10;
  position: absolute;
  top: 50vh;
  text-align: center;
  padding-top: 8px;
}

#app .floatBtn.left {
  left: 10px;
}

#app .floatBtn.right {
  right: 10px;
}

#app .floatBtn.bottom {
  left: 49%;
  top: 90%;
}

#app .empty {
  text-align: center;
  margin-top: 48vh;
}