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HTML 

              
                <header>
  <h2>Sass animated hamburger mixin</h2>
  <p>
    <a href="http://codepen.io/rolandtoth/pen/LypvrV?editors=1100" target="_blank" class="active">Sass</a>
    <a href="http://codepen.io/rolandtoth/pen/rzYPKK?editors=1100" target="_blank">Stylus</a>
    <a href="https://codepen.io/rolandtoth/pen/qXpoMd?editors=1100" target="_blank">LESS</a>
  </p>
</header>


<div class="examples">
  <p>
    <input type="checkbox" id="toggle-defaults" />
    <label for="toggle-defaults"><i></i><span>Defaults</span></label>
    <em></em>
  </p>

  <p>
    <input type="checkbox" id="toggle-custom-size" />
    <label for="toggle-custom-size"><i></i><span>Custom size</span></label>
    <em></em>
  </p>

  <p>
    <input type="checkbox" id="toggle-custom-animation" />
    <label for="toggle-custom-animation"><i></i><span>Custom animation</span></label>
    <em></em>
  </p>

  <p>
    <input type="checkbox" id="toggle-radius" />
    <label for="toggle-radius"><i></i><span>Radius</span></label>
    <em></em>
  </p>

  <p>
    <input type="checkbox" id="toggle-padding" />
    <label for="toggle-padding"><i></i><span>Padding</span></label>
    <em></em>
  </p>

  <p>
    <input type="checkbox" id="toggle-text-on-right" />
    <label for="toggle-text-on-right"><i></i><span>Text on right + align-left style</span></label>
    <em></em>
  </p>

  <p>
    <input type="checkbox" id="toggle-text-on-left" />
    <label for="toggle-text-on-left"><i></i><span>Text on left + align-right style</span></label>
    <em></em>
  </p>

  <p>
    <input type="checkbox" id="toggle-tint" />
    <label for="toggle-tint"><i></i><span>Tint</span></label>
    <em></em>
  </p>
  
  <p>
    <input type="checkbox" id="toggle-solid-background" />
    <label for="toggle-solid-background"><i></i><span>Solid background</span></label>
    <em></em>
  </p>

  <p>
    <input type="checkbox" id="toggle-noanim" />
    <label for="toggle-noanim"><i></i><span>No animation</span></label>
    <em></em>
  </p>
  
  <p class="dark">
    <input type="checkbox" id="toggle-above-dark-background" />
    <label for="toggle-above-dark-background"><i></i><span>Above dark background</span></label>
    <em></em>
  </p>
</div>

<footer>
  <p>
    <a href="https://github.com/rolandtoth/hamburger-mixin" target="_blank">View on GitHub</a>
  </p>
</footer>
!

CSS 

              
                // helper mixin
@mixin hamburger_tint($color: #000, $tint_text: false, $labelselector: '+ label') {
  #{$labelselector} {
    i, &::before, &::after {
      background-color: $color;
    }
    @if $tint_text {
      span {
        color: $color;
      }
    }
  }
}

// main mixin
@mixin hamburger($width: 32px, $thickness: 3px, $gap: 7px, $color: #000, $background: transparent, $tint_text: false, $radius: 0, $radius_background: 0, $anim: 0.25s, $labelselector: '+ label', $padding: 0, $text: 'right', $style: false) {
  $height: ($thickness*3) + ($gap*2);
  @if $background != transparent and $padding == 0 {
    $padding: round(($thickness + $gap) / 1.5);
  }
  display: none;
  #{$labelselector} {
    user-select: none;
    position: relative;
    display: inline-block;
    width: $width;
    height: $height;
    box-sizing: content-box;
    border: $padding solid transparent;
    z-index: 1050;
    line-height: $height;
    white-space: nowrap;
    background: $background;
    border-radius: $radius_background;
    span {
      display: inline-block;
      position: absolute;
      left: 100%;
      margin-top: 1px;
      transition: color $anim;
      margin-left: $padding;
      @if $text == false {
        display: none;
      }
      @elseif $text == 'left' {
        left: auto;
        right: 100%;
        margin-left: 0;
        margin-right: $padding;
      }
      &::before, &::after {
        content: '';
        display: inline-block;
        min-width: 10px;
        width: $width*0.2;
      }
    }
    i, &::before, &::after {
      position: absolute;
      left: 0;
      display: block;
      will-change: transform, background-color;
      width: $width;
      height: $thickness;
      border-radius: $radius;
      transition: transform $anim, background-color $anim;
      backface-visibility: hidden;
      outline: 1px solid transparent; // Firefox jagged animation fix
    }
    i {
      top: $thickness + $gap;
      // hide text
      font-size: 0;
      color: transparent;
      line-height: 0;
      @if $style == 'align-left' {
        max-width: $width * 0.75;
        transform-origin: 66% center;
      } @elseif $style == 'align-right' {
        max-width: $width * 0.75;
        margin-left: $width * 0.25;
        transform-origin: 33% center;
      }
    }
    &::before, &::after {
      content: '';
    }
    &::before {
      top: 0;
    }
    &::after {
      bottom: 0;
    }
    &:hover {
      cursor: pointer;
    }
  }
  &:checked {
    @if $anim != -1 {
      #{$labelselector} {
        i {
          transform: scaleX(0.001);
        }
        &::before {
          transform: translateY($gap + $thickness) rotate(45deg);
        }
        &::after {
          transform: translateY(-($gap + $thickness)) rotate(-45deg);
        }
      }
    }
  }
  @include hamburger_tint($color, $tint_text, $labelselector);
}

// Usage

#toggle-defaults {
  @include hamburger();
}

#toggle-custom-size {
  @include hamburger($width: 50px, $thickness: 1px, $gap: 16px);
}

#toggle-custom-animation {
  @include hamburger($anim: cubic-bezier(0.68, -0.55, 0.265, 1.55) 0.33s);
}

#toggle-tint {
  @include hamburger($color: crimson, $tint_text: true);
  &:checked {
    @include hamburger_tint($color: darkgrey, $tint_text: true);
    &:hover {
      @include hamburger_tint($color: blue, $tint_text: true);
    }
  }
  &:hover {
    @include hamburger_tint($color: green, $tint_text: true);
  }
}

#toggle-radius {
  @include hamburger($width: 40px, $thickness: 6px, $color: coral, $radius: 6px);
}

#toggle-padding {
  @include hamburger($width: 24px, $thickness: 2px, $gap: 5px, $padding: 24px);
  &:hover {
    @include hamburger_tint(orange);
  }
}

#toggle-text-on-left {
  @include hamburger($text: left, $style: 'align-right');
}

#toggle-text-on-right {
  @include hamburger($text: right, $style: 'align-left');
}

#toggle-solid-background {
  @include hamburger($background: #FF6347, $width: 17px, $thickness: 3px, $gap: 4px, $padding: 12px, $color: white, $radius_background: 50%);
}

#toggle-noanim {
  @include hamburger($anim: -1);
}

#toggle-above-dark-background {
  @include hamburger($color: white);
  &:checked {
    @include hamburger_tint($color: #293134, $tint_text: true);
  }
}

// Presentation styles

body {
  padding: 0 20px 20px;
  background: #eaebec;
  font-family: sans-serif;
}
header {
  text-align: center;
}
header, .examples p {
  padding: 12px 0;
  margin: 6px 0;
}
header a, .examples p a {
  display: inline-block;
  margin: 0 6px;
  color: inherit;
}
header a.active, .examples p a.active {
  color: #888;
  text-decoration: none;
}
.examples p {
  line-height: 0;
  background: #fff;
  position: relative;
}
.examples p > span {
  display: inline-block;
  min-width: 320px;
  position: relative;
  top: -5px;
  padding-left: 16px;
}
.examples p.dark {
  color: #fff;
  background: #293134;
}
label {
  position: absolute;
  left: 50%;
  transform: translateX(-50%);
}
label span {
  transition: all 0.2s !important;
}
label:not([for="toggle-text-on-left"]):not([for="toggle-text-on-right"]) span {
  display: inline-block !important;
  opacity: 0.3;
}
label:hover span {
  opacity: 1 !important;
}

input {
  ~ em {
    position: absolute;
    left: 0;
    right: 0;
    top: 0;
    bottom: 0;
    display: block;
    background: #eaebec;
    transition: all 0.2s;
    transform: scaleX(0);
  }
  &:checked ~ em {
    transform: scaleX(1);
  }
}

footer {
  text-align: center;
  font-size: 13px;
  margin: 24px 0;
  a {
    color: #777;
  }
}
!

JS
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