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              <div class="wrapper">
  <div class="item">
    <div class="item-inner">
      <a href="#" class="sonar"></a>
    </div>
  </div>

  <div class="item">
    <div class="item-inner">
      <a href="#" class="slack"></a>
    </div>
  </div>
  
  <div class="item">
    <div class="item-inner">
      <a href="#" class="wheel"></a>
    </div>
  </div>
  
  <div class="item">
    <div class="item-inner">
      <a href="#" class="swoop"></a>
    </div>
  </div>
  
  <div class="item">
    <div class="item-inner">
      <a href="#" class="wheel wheel-alt"></a>
    </div>
  </div>
  
  <div class="item">
    <div class="item-inner">
      <a href="#" class="wheel wheel-alt2"></a>
    </div>
  </div>
  
  <div class="item">
    <div class="item-inner">
      <a href="#" class="egg"></a>
    </div>
  </div>
  
  <div class="item">
    <div class="item-inner">
      <a href="#" class="morph"></a>
    </div>
  </div>
  
  <div class="item">
    <div class="item-inner">
      <a href="#" class="sq"></a>
    </div>
  </div>
  
  <div class="item">
    <div class="item-inner">
      <a href="#" class="target"></a>
    </div>
  </div>
</div>
            
          
!
            
              /*------------------------------------------------*\
  Mixins
\*------------------------------------------------*/

@mixin square ($size: 20px) {
  width: $size;
  height: $size;
}

@mixin round ($size: 20px) {
  @include square($size);
  border-radius: 50%;
}

@mixin center {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
}



/*------------------------------------------------*\
  Target
\*------------------------------------------------*/

$target-round-size: 18px;
$target-round-border-color: lighten(#000, 70%);
$target-triangle-size: 10px;
$target-triangle-color: lighten(#000, 70%);

@keyframes target {
  0% { transform: rotateZ(0) scale(.6); }
  50% { transform: rotateZ(180deg) scale(1); }
  100% { transform: rotateZ(360deg) scale(.6); }
}

.target {
  position: relative;
  background-color: #fff;
  border: 2px solid $target-round-border-color;
  box-shadow: 0 0 4px 2px rgba(#000, .2);
  animation: target 2s linear infinite;
  
  @include round($target-round-size);
  
  &:before,
  &:after {
    content: "";
    display: block;
    position: absolute;
  }
  
  &:before {
    top: 16px;
    left: 16px;
    
    width: 0;
    height: 0;
    border-style: solid;
    border-width: $target-triangle-size $target-triangle-size 0 0;
    border-color: $target-triangle-color transparent transparent transparent;
  }
  
  &:after {
    bottom: 16px;
    right: 16px;
    
    width: 0;
    height: 0;
    border-style: solid;
    border-width: 0 0 $target-triangle-size $target-triangle-size;
    border-color: transparent transparent $target-triangle-color transparent;
  }
}



/*------------------------------------------------*\
  sq
\*------------------------------------------------*/

$sq-color: #46d9c0;
$sq-color-dark: darken($sq-color, 20%);

@keyframes sq {
  from { box-shadow: 0 0 0 0 rgba(#fff, 1), 0 0 0 0 rgba(#fff, 1); }
  to { box-shadow: 0 0 0 8px rgba(#fff, 0), 0 0 0 12px rgba(#fff, 0); }
}

.sq {
  @include square(24px);
  
  position: relative;
  border-radius: 20%;
  background-color: rgba($sq-color, .6);
  box-shadow: inset 0 0 8px 6px rgba($sq-color-dark, .4), 0 0 4px 2px rgba(#000, .2);
  transform: rotateZ(45deg);
  
  &:before {
    @include round(6px);
    @include center;
    
    content: "";
    display: block;
    background-color: rgba(#fff, .4);
    animation: sq 800ms infinite;
  }
}



/*------------------------------------------------*\
  Morph
\*------------------------------------------------*/

$morph-color: #f72d41;
$morph-size: 36px;
$morph-inner-size: $morph-size / 2;

@keyframes morph {
  0% { transform: rotateZ(0); border-radius: 20%; }
  50% { transform: rotateZ(45deg); border-radius: 50%; }
  100% { transform: rotateZ(90deg); border-radius: 20%; }
}

.morph {
  @include square($morph-size);
  
  position: relative;
  box-shadow: 0 0 6px 4px rgba($morph-color, .4);
  animation: morph 1s linear infinite;
  
  &,
  &:before {
    background-color: rgba($morph-color, .6);
  }
  
  &:before {
    @include center;
    @include round($morph-inner-size);
    
    content: "";
    display: block;
  }
}



/*------------------------------------------------*\
  Egg
\*------------------------------------------------*/

$egg-color: #f77e2d;
$egg-size: 40px;
$egg-center-size: $egg-size / 2;

@keyframes egg {
  from { box-shadow: inset 0 0 12px 6px rgba($egg-color, .6); }
  to { box-shadow: inset 0 0 4px 2px rgba($egg-color, .4); }
}

.egg {
  @include round($egg-size);
  
  position: relative;
  box-shadow: inset 0 0 6px 4px rgba($egg-color, .6);
  animation: egg 600ms linear infinite;
  animation-direction: alternate;
  
  &:before {
    @include round($egg-center-size);
    @include center;
    
    content: "";
    display: block;
    background-color: rgba($egg-color, .8);
    border: 2px solid $egg-color;
  }
}



/*------------------------------------------------*\
  Wheel
\*------------------------------------------------*/

$green: #37b475;
$wheel-size: 40px;
$wheel-decrement: 20px;
$wheel-border-width: 4px;

@keyframes wheel {
  from { transform: rotateZ(0); }
  to { transform: rotateZ(-360deg); }
}

.wheel {
  @include round($wheel-size);
  
  position: relative;
  border: $wheel-border-width dashed $green;
  animation: wheel 6s linear infinite;
  box-shadow: inset 0 0 4px 2px rgba($green, .6);
  
  &:before {
    @include round($wheel-size - $wheel-decrement);
    @include center;
    
    content: "";
    display: block;
    background-color: $green;
  }
}



/*------------------------------------------------*\
  Wheel Alt
\*------------------------------------------------*/

.wheel-alt {
  box-shadow: inset 0 0 0 2px lighten($green, 10%);
  border-color: lighten($green, 10%);
  
  &:before {
    border: 2px solid darken($green, 5%);
    box-shadow: 0 0 2px 2px rgba(#000, .3);
  }
}



/*------------------------------------------------*\
  Wheel Alt 2
\*------------------------------------------------*/

.wheel-alt2 {
  box-shadow: none;
  border-color: darken($green, 5%);
  
  &:before {
    border: 2px solid darken($green, 5%);
  }
}



/*------------------------------------------------*\
  Swoop
\*------------------------------------------------*/

$blue: #67c1ea;
$swoop-bg: white;

@keyframes swoop {
  0% { box-shadow: inset 0 0 0 0 $blue, inset 0 0 0 0 $swoop-bg; }
  50% { box-shadow: inset 0 0 0 0 $blue, inset 0 0 0 15px $swoop-bg; }
  100% { box-shadow: inset 0 0 0 15px $blue, inset 0 0 0 15px $swoop-bg; }
}

.swoop {
  @include round(30px);
  
  animation: swoop 1s infinite;
  animation-direction: reverse;
  animation-timing-function: cubic-bezier(0.71, 0.13, 1, 0.71);
  background-color: $blue;
}



/*------------------------------------------------*\
  Slack
\*------------------------------------------------*/

$white: #fff;
$black: #000;
$slack-size: 20px;
$slack-ring-size: $slack-size * 2;
$slack-ring-border: 4px;
$slack-increment: 10px;

@keyframes slack {
  from {
    transform: translate(-50%, -50%) scale(1);
  }
  
  to {
    transform: translate(-50%, -50%) scale(1.5);
  }
}

.slack {
  @include round($slack-size);
  
  position: relative;
  background-color: $white;
  box-shadow: 0 0 4px 2px rgba($black, .2);
  
  &:before {
    @include center;
    @include round($slack-ring-size);
    
    content: "";
    display: block;
    border: $slack-ring-border solid $white;
    box-shadow: inset 0 0 4px 2px rgba($black, .2), 0 0 4px 2px rgba($black, .2);
    animation: slack 400ms linear infinite;
    animation-direction: alternate;
  }
}



/*------------------------------------------------*\
  Sonar
\*------------------------------------------------*/

$pink: #ff93df;
$sonar-size: 20px;

@keyframes sonar {
  from { box-shadow: 0 0 0 0 rgba($pink, 1), 0 0 4px 2px rgba(#000, .4); }
  to { box-shadow: 0 0 0 10px rgba($pink, 0), 0 0 4px 2px rgba(#000, .4); }
}

.sonar {
  @include round($sonar-size);
  
  background-color: $pink;
  border: 2px solid darken($pink, 10%);
  animation: sonar 800ms ease-out infinite;
}



/*------------------------------------------------*\
  Uninteresting stuff
\*------------------------------------------------*/

$item-size: 150px;
$item-margin: 10px;

*,
*:before,
*:after {
  box-sizing: border-box;
}

.wrapper {
  width: 5 * ($item-size + $item-margin * 2);
  margin: 20px auto;
}

.item {
  display: table;
  float: left;
  width: $item-size;
  height: $item-size;
  border: 2px solid #dadada;
  margin: $item-margin;
  &:nth-of-type(even) { background-color: #eee; }
}

.item-inner {
  display: table-cell;
  vertical-align: middle;
  text-align: center;
  
  > a {
    text-decoration: none;
    display: inline-block;
  }
}
            
          
!
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