body {
  font-family: sans-serif;
  text-align: center;
  background: #ccc;
  color: white;
  margin: 0;
  padding: 0;
}

h1 {
  margin-top: 10px;
}

#levelIndicator {
  margin: 20px auto;
  width: 200px;
  height: 200px;
  border: 4px solid white;
  border-radius: 50%;
  position: relative;
  background: #333;
}

#bubble {
  width: 50px;
  height: 50px;
  border-radius: 50%;
  background: red;
  position: absolute;
  top: 85px;
  left: 85px;
  transition: top 0.1s, left 0.1s;
}

#status {
  margin-top: 15px;
  font-size: 1.1em;
}

video {
  margin-top: 20px;
  width: 90%;
  max-width: 400px;
  border: 2px solid white;
}