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CSS Base

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              svg#square(data-name="Loader" xmlns="http://www.w3.org/2000/svg" viewBox="0 0 94 103")
 rect#rect.cls-1(x="5" y="5" width="84" height="93")

  background #1abc9c
  transition-duration 2s
  position absolute
  left 0 
  right 0
  top 45%
  margin 0 auto
  width 100px

  fill none
  stroke #f2f2f2
  stroke-miterlimit 10
  stroke-width 10px

              var sq = document.getElementById('rect'),
    body = document.body,
    tl = new TimelineMax({repeat:-1, yoyo: true});
      .from(sq, 0.7, {drawSVG:'0', ease:Linear.easeInOut})
      .to(body, 0.5, {css:{background:'#f1c40f'}, ease:Linear.easeOut}, 0.25)
      .to(body, 0.5, {css:{background:'#2ecc71'}, ease:Linear.easeOut}, 0.75)
      .to(body, 0.5, {css:{background:'#3498db'}, ease:Linear.easeOut}, 1.25);
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