button {
  -webkit-box-align: center;
      -ms-flex-align: center;
          align-items: center;
  display: none;
  font-size: 20px;
  position: absolute;
  left: 50%;
  bottom: 50px;
  -webkit-transform: translateX(-50%);
          transform: translateX(-50%);
  -webkit-box-pack: center;
      -ms-flex-pack: center;
          justify-content: center;
  width: 90%;
  height: 50px;
  z-index: 10;
}

.is-enabled button#end {
  display: -webkit-box;
  display: -ms-flexbox;
  display: flex;
}

.is-disabled button#start {
  display: -webkit-box;
  display: -ms-flexbox;
  display: flex;
}

#webcamFlow {
  -o-object-fit: cover;
     object-fit: cover;
  background: #999;
  position: absolute;
  inset: 0;
  width: 100vw;
  height: 100vh;
}

.dotContainer {
  -webkit-transform: perspective(500px);
          transform: perspective(500px);
  position: absolute;
  inset: 0;
  z-index: 2;
}
.dotContainer .dotHorizontal {
  width: 100%;
  height: 100%;
}
.dotContainer .dotVertical {
  width: 100%;
  height: 100%;
}

#dotReference {
  aspect-ratio: 1;
  position: absolute;
  left: calc(50% - 25px);
  top: calc(50% - 25px);
  width: 50px;
  border-radius: 50%;
  background: rgba(255, 0, 0, 0.5);
  display: none;
  z-index: 3;
}

.is-enabled #dotReference {
  display: block;
}