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HTML

              
                span.loading


              
            
!

CSS

              
                $size: 100px
$color: #088
$duration: 1000ms //in ms

@keyframes loadingAnimation
   0%
      border-width: 0
      width: 0
      height: 0
      margin: 0
      opacity: 0.1
   50%
      border-width: round($size / 10)
      opacity: 0.8
   100%
      border-width: 0
      width: $size
      height: $size
      margin: round($size / -2)
      opacity: 0.1
.loading      
   &:before, &:after
      content: ''
        
.loading,
.loading:before,
.loading:after
   display: block    
   position: fixed
   top: 50%
   left: 50%
   box-sizing: border-box
   border:
      radius: 50%
      width: 0
      color: $color
      style: solid
   animation:
      name: loadingAnimation
      duration: $duration
      iteration-count: infinite
.loading:before      
   animation-delay: round($duration / 3)
.loading:after      
   animation-delay: round($duration / 3) * 2
              
            
!

JS

              
                
              
            
!
999px

Console