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HTML

            
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<div class="ui center aligned container">
  <div class="ui teal button onion">Toggle onion skin</div>
</div>
!

CSS

            
              body {
  background: Gainsboro;
}
.svg-container {
  height: 310px;
  [class*=svg-] {
    display: inline-block;
    position: absolute;
    // transitioning all, as we're catching 
    // 2 transitions here
    transition: all ease-out 0.3s;
    height: 286px;
    width: 173px;
    &:nth-child(odd) {
      // positioning is placement - half 
      // the width of your target
      left: calc(60% - 86px);
      @media (max-width: 500px) {
        left: 10px;
      }   
    }
    &:nth-child(even) {
      left: calc(40% - 86px);
      @media (max-width: 500px) {
        left: calc(95% - 173px);
      }       
    }
    &.svg-onion {
      left: calc(50% - 86px);
       svg {
        // nested here to only affect opacity
        // when .svg-onion is added
        fill-opacity: .6;
      }     
    }
  }
}
!

JS

            
              $('.onion')
.on(
  'click',
  function() {
    $('[class*=svg-]').toggleClass('svg-onion');
  }
);
!
999px
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