HTMLify

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

input,button {
  position: absolute;
  top: 0%;
  left: 50%;
  transform: translateX(-50%);
  z-index: 999;
  margin-top: 10px;
}
input:before {
  content: 'Slide to change the angle between each branch';
  position: absolute;
  bottom: -60px;
  text-align: center;
  color: "#fff";
}
button {
  margin-left: 10%;
}