html, body {
  background-color: #222;
  width: 100%;
  height: 100%;
  margin: 0px;
  border: 0px;
  padding: 0px;
  overflow: hidden;
  color: #fff;
  font-family: Helvetica, Arial, sans-serif;

  display: flex;
  justify-content: center;
  align-items: center;
}

#controls {
  text-align: center;
  display: inline-block;
}

#controls > img {
  width: 10rem;
  height: 10rem;
}

#settings {
  display: table;
}

#settings > * {
  display: table-row;
  text-align: center;
}

#settings > div > * {
  display: table-cell;
  vertical-align: middle;
  margin: .5rem 1rem;
}

#settings > div > :first-child {
  text-align: right;
}

#settings > div > :last-child {
  text-align: left;
}

#startButton {
  margin: .5rem;
  width: 33%;
  height: 2rem;
}

#installButton {
  position: fixed;
  bottom: 0;
  left: 50%;
  transform: translateX(-50%);
  padding: .7rem 1.3rem;
  background-color: #0074d9;
  color: #fff;
  border: none;
  border-radius: 20px 20px 0 0;
  cursor: pointer;
}

canvas {
  padding: 0;
  margin: 0;
  display: block;
  position: absolute;
  top: 0;
  bottom: 0;
  left: 0;
  right: 0;
}