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              - var totSpinners = 8
- for (var i = 1; i <= totSpinners; i++)
  .cell
    .wrapper
      div( class="spinner spinner" + i)
            
          
!
            
              // TYPOGRAPHY
@import url('https://fonts.googleapis.com/css?family=Source+Serif+Pro');
$font-family: 'Source Serif Pro', serif;

// COLORS
$white: #fff;
$black: #000;
$back: dodgerblue; // Change the color if you want

// GENERAL
*, *::before, *::after{
  box-sizing: border-box;
}
body{
  display: flex;
  flex-wrap: wrap;
  font-family: $font-family;
  font-size: 16px;
  background: $back;
  // Spinner count reference
  counter-reset: spinnerCount; 
}
.cell{
  width: 25%;
  .wrapper{
    position: relative;
    display: flex;
    justify-content: center;
    height: 10rem;
    margin: 1rem 1rem 0;
    padding-top: 2.2rem;
    background: rgba($white, .2);  
    &::after{
      position: absolute;
      bottom: 0;
      width: 100%;
      padding: 0.2rem;
      text-align: center;
      background: rgba($white, .25);
      /* Increment the section counter */
      counter-increment: spinnerCount;
      /* Display the counter on pseudo-elements */
      content: counter(spinnerCount);
    }
  }
}


// SPINNERS STYLES
.spinner{
  // Common styles
  width: 4rem;
  height: 4rem;
  // Individual styles
  &.spinner1{
    border: 3px solid rgba($white, .25);
    border-top-color: rgba($black, .5);
    border-radius: 50%;
    animation: rotation .8s ease infinite;
  }
  &.spinner2{
    border: 3px solid transparent;
    border-top-color: rgba($black, .5);
    border-bottom-color: rgba($black, .5);
    border-radius: 50%;
    animation: rotation .8s ease infinite;
  }
  &.spinner3{
    border-top: 3px solid rgba($black, .5);
    border-right: 3px solid transparent;
    border-radius: 50%;
    animation: rotation .8s linear infinite;
  }
  &.spinner4{
    background: rgba($black, .5);
    animation: flip 1.2s ease infinite;
  }
  &.spinner5{
    margin-top: 2rem; // just for centering the demo
    overflow: hidden;
    position: relative;
    height: .5rem;
    background: rgba($white, .25);
    &::before{
      content: '';
      position: absolute;
      left: -130%;
      width: 100%;
      height: 100%;
      background: rgba($black, .5);
      animation: progress 4s linear infinite;
    }
    
  }
  &.spinner6{
    position: absolute;
    top: 45%;
    left: 50%;
    background: $white;
    border-radius: 50%;
    animation: pulse 1s ease-in-out infinite;
    transform: translate(-50%, -50%) scale(0);
  }
  &.spinner7{
    position: relative;
    &::before, &::after{
      content: '';
      position: absolute;
      top: 50%;
      left: 50%;
      width: 100%;
      height: 100%;
      border-radius: 50%;
      transform: translate(-50%, -50%) scale(0);
    }
    &::before{
      background: $white;
      animation: pulse2 2s ease-in-out infinite;
    }
    &::after{
      background: $white;
      animation: pulse2 2s 1s ease-in-out infinite;
    }
  }
  &.spinner8{
    position: relative;
    perspective: 200px;
    &::before{
      display: block;
      content: '';
      width: 50%;
      height: 50%;
      background: rgba($black, .5);
      animation: 2s flipWalker ease infinite;
    }
  }
}


// ANIMATIONS
@keyframes rotation{
  from{
    transform: rotate(0deg);
  }
  to{
    transform: rotate(360deg);
  }
}

@keyframes flip{
  0%{
    transform: perspective(120px) rotateX(0deg) rotateY(0deg);
  }
  50%{
    transform: perspective(120px) rotateX(-180deg) rotateY(0deg);
  }
  100%{
    transform: perspective(120px) rotateX(-180deg) rotateY(-180deg);
  }
}

@keyframes progress{
  0%{
    left: -130%;
    background: rgba($black, .5);
  }
  50%{
    left: 130%;
    background: rgba($black, .5);
  }
  51%{
    background: rgba($white, .5);
  }
  100%{
    background: rgba($white, .5);
  }
}

@keyframes pulse{
  0%{
    transform: translate(-50%, -50%) scale(0);
    opacity: 1;
  }
  100%{
    transform: translate(-50%, -50%) scale(1.0);
    opacity: 0;
  }
}

@keyframes pulse2{
  0%, 100%{
    transform: translate(-50%, -50%) scale(0);
    opacity: 1;
  }
  50%{
    transform: translate(-50%, -50%) scale(1.0);
    opacity: 0;
  }
}

@keyframes flipWalker{
  0%{
    transform: translate(0, 0) rotateX(0) rotateY(0);
  }
  25%{
    transform: translate(100%, 0) rotateX(0) rotateY(180deg);
  }
  50%{
    transform: translate(100%, 100%) rotateX(-180deg) rotateY(180deg);
  }
  75%{
    transform: translate(0, 100%) rotateX(-180deg) rotateY(360deg);
  }
  100%{
    transform:  translate(0, 0) rotateX(0) rotateY(360deg);
  }
}
            
          
!
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