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HTML

              
                <section class="loader">
  <section class="pull-left">
    <div class="circle static-circle"></div>
  </section>
  
  <div class="circle counter counter-1"></div>
  <div class="circle counter counter-2"></div>
  <div class="circle counter counter-3"></div>
  
  <section class="pull-right">
    <div class="circle static-circle"></div>
  </section>
</section>
              
            
!

CSS

              
                html
  background: #333
  
.loader
  width: 400px
  margin: 5% 10% 0
  position: relative

.pull-left
  float: left
    
  
.pull-right
  float: right
  .circle
    transform: scale(.4)

.circle
  height: 100px
  width: 100px
  border-radius: 50%
  background: pink
  transition: transform 0.8s ease
  box-shadow: 0 0 3px 1px lighten(pink,30)
  position: absolute
  z-index: 1
  &.counter
    height: 40px
    width: 40px
    background: pink
    top: 30px
    left: 30px
    z-index: 0
    transition: transform 1s ease
    transform: scale(1,.1)
              
            
!

JS

              
                var loader_width = 400,
    right_outside = loader_width+60,
    right_inside = loader_width+25,
    left_outside = -15,
    left_inside = 30,
    i=1,
    circle_diameter_right = $('.pull-right .static-circle').height(),
    circle_diameter_left = $('.pull-left .static-circle').height();

setInterval(function(){
  if(i <= 3){
    // First 3 move right
    moveRight(i);
  }else if(i >= 4 && i <= 6){
    // Second 3 move left
    moveLeft(i);
  }else if(i >= 7){
    // at 7 reset and then move right
    i=1;
    moveRight(i);
  }
}, 1500);

function moveRight(val){
  // transform left static-circle smaller as circles leave
  if(i === 1){
    $('.pull-left .static-circle').css({
      'transform': 'scale(.8)'
    });
  }else if(i === 2){
    $('.pull-left .static-circle').css({
      'transform': 'scale(.6)'
    });
  }else if(i === 3){
    $('.pull-left .static-circle').css({
      'transform': 'scale(.4)'
    });
  }
  
  // increase the size of the counter-circle as it moves across
  $('.counter-'+i).css({
    'transform':'scale(1,1.2)'
  });
  
  $('.counter-'+i).animate({
    // animate moving to the far right
    left: right_outside
  }, 800, function(){
    // center the counter-cirlce on the right static-circle
    $('.counter-'+i).animate({
      left: right_inside
    }, 200);
    
    // increase the size of the static circle as the counter cirlces are added
    if(i === 1){
      $('.pull-right .static-circle').css({
        'transform': 'scale(.6)'
      });
    }else if(i === 2){
      $('.pull-right .static-circle').css({
        'transform': 'scale(.8)'
      });
    }else if(i === 3){
       $('.pull-right .static-circle').css({
        'transform': 'scale(1)'
      });
    }
    
    // decrease the size of the counter-circle (prep for moving back)
    $('.counter-'+i).css({
      'transform':'scale(1,.1)'
    });
    
    i++;
  });
}

function moveLeft(val){
  // only want a count of 1-3 for finding counter circle numbers
  if(i>=4){
    i-=3;
  }
  
  // transform left static-circle smaller as circles leave
  if(i === 1){
    $('.pull-right .static-circle').css({
      'transform': 'scale(.8)'
    });
  }else if(i === 2){
    $('.pull-right .static-circle').css({
      'transform': 'scale(.6)'
    });
  }else if(i === 3){
    $('.pull-right .static-circle').css({
      'transform': 'scale(.4)'
    });
  }
  
  // increase the size of the counter-circle as it moves across
  $('.counter-'+i).css({
    'transform':'scale(1,1.2)'
  });
  
  $('.counter-'+i).animate({
    // animate moving to the far left
    left: left_outside
  }, 800, function(){
    // center the counter-cirlce on the left static-circle
    $('.counter-'+i).animate({
      left: left_inside
    }, 200);
    
    // increase the size of the static circle as the counter cirlces are added
    if(i === 1){
      $('.pull-left .static-circle').css({
        'transform': 'scale(.6)'
      });
    }else if(i === 2){
      $('.pull-left .static-circle').css({
        'transform': 'scale(.8)'
      });
    }else if(i === 3){
      $('.pull-left .static-circle').css({
        'transform': 'scale(1)'
      });
    }
    
    // decrease the size of the counter-circle (prep for moving back)
    $('.counter-'+i).css({
      'transform':'scale(1,.1)'
    });
    
    i+=4;
  });
}
              
            
!
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