.hamburger.demo
  .stripe
  .stripe
  .stripe

// Colors:
$first-gradient-color: #A6FFA7;
$second-gradient-color: #A6DAFF;
$third-gradient-color: #BCA6FF;

// Proportions:
$icon-height: 30px;
$rotate-reverse: true;

html,
body {
  height: 100%;
}

body {
  margin: 0;
  background: linear-gradient(45deg, $first-gradient-color, $second-gradient-color, $third-gradient-color);
}

.hamburger {
  position: relative;
  width: $icon-height * 1.4;
  height: $icon-height;
  cursor: pointer;
}

.demo {
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
}

.stripe {
  position: absolute;
  width: 100%;
  height: 20%;
  
  background: #333;
  transition: all .3s,
              top .2s,
              opacity .2s;
}

.stripe:first-child {
  top: 0;
}

.stripe:nth-child(2) {
  top: 40%;
}

.stripe:last-child {
  top: 80%;
}

.hamburger:hover .stripe:first-child {
  top: 40%;
  transform: rotate(45deg);
}

.hamburger:hover .stripe:nth-child(2) {
  opacity: 0;
}

.hamburger:hover .stripe:last-child {
  top: 40%;
  @if $rotate-reverse {
    transform: rotate(135deg);
  } @else {
    transform: rotate(-45deg);
  }
}

// Nothing here