@property --angle {
  syntax: '<angle>';
  inherits: false;
  initial-value: 0deg;
}

body {
  --angle: 20deg;
  background: repeating-conic-gradient(
    from var(--angle),
    white 0deg,
    goldenrod 10deg 20deg,
    white 30deg
  );
  transition: --angle 0.5s 0.1s;
  height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
}

@keyframes rotate {
  from {
    --angle: 0deg;
  }
  to {
    --angle: 360deg;
  }
}

button#launch-webcam {
  position: fixed;
  z-index: 1;
}

#video-wrapper {
  position: relative;
}

video {
  border-radius: 50%;
  clear: both;
  display: block;
  transform: rotateY(180deg);
  -webkit-transform: rotateY(180deg);
  -moz-transform: rotateY(180deg);
  filter: sepia(100%);
}

.halo {
  position: absolute;
}

.face-highlighter {
  background: rgba(0, 255, 0, 0.25);
  border: 1px solid #fff;
  z-index: 1;
  position: absolute;
}

.key-point {
  position: absolute;
  z-index: 1;
  width: 3px;
  height: 3px;
  background-color: #ff0000;
  border-radius: 50%;
  display: block;
}