schulzestudio/src/css/layout/_nav.scss

/* Nav */

  #nav {
    > div > span {
      &.bar {
        height: 10px;
        display: block;
        border-radius: 5px;
    		@include vendor('transition', (
    			'transform #{_duration(transition)} ease',
    		));

      }

      &.bar1 {
        width: 60px;
        background: _palette(accent1);
        margin: 15px 30px;
        @include vendor('transform-origin', '55px 5px');

        &.active {
          @include vendor('transform', 'rotate(45deg)');
        }
      }

      &.bar1:first-child {
        @include vendor('transform-origin', '5px 5px');
      }

      &.bar2 {
        width: 80px;
        background: _palette(accent2);
        margin: 7px 20px;
        z-index: 99;

        &.active {
          @include vendor('transform', 'rotate(-45deg)');
          transform: rotate(-45deg);
        }
      }
    }
  }