body {
    margin: 0;
    overflow: hidden;
  }
canvas {
  width: 100%;
  height: 100%;
  padding: 0;
  margin: 0;
}

#blocker {
  position: absolute;
  width: 100%;
  height: 100%;
  background-color: rgba(0,0,0,0.5);
}

#instructions {
  width: 100%;
  height: 100%;

  display: -webkit-box;
  display: -moz-box;
  display: box;

  -webkit-box-orient: horizontal;
  -moz-box-orient: horizontal;
  box-orient: horizontal;

  -webkit-box-pack: center;
  -moz-box-pack: center;
  box-pack: center;

  -webkit-box-align: center;
  -moz-box-align: center;
  box-align: center;

  color: #ffffff;
  text-align: center;
  font-family: Arial;
  font-size: 14px;
  line-height: 24px;

  cursor: pointer;
}

#hint {
  position: absolute;
  top: 5px;
  right: 10px;
  color: #ddd;
  font-size: 10px;
  font-family: Arial;
  display: none;
}