html,
body {
  width: 100%;
  height: 100%;
  overflow: hidden;
  margin: 0;
  background: #eee;
  font-family: sans-serif;
}

.instructions {
  position: absolute;
  padding: 20px;
}
h1 {
  left: 20px;

  font-size: 4vw;
}

h2 {
  font-size: 3.2vw;
  color: #666;
}
.circle {
  width: 40px;
  height: 40px;
  background: blue;
  position: absolute;
  border-radius: 50%;
  opacity: 0.4;
}