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              <div class="wrapper">
  <div class="content">
    This is a good day. Maybe.
  </div>
  <div class="rotate"></div>
  <div class="mask"></div>
</div>

<button data-type="restart">restart</button>
            
          
!
            
              @import "compass/css3";

* {
  box-sizing:border-box;
}

$width: 200px;
$height: 200px;
$duration: 2s;
$delay: 1s;
$color-alpha: #308991;
$color-beta: #80c144;
$color-gamma: #b83d54;

body {
  background:$color-alpha;
  font: 1em/1.65em sans-serif;
  color: #fff;
}

.wrapper {
  position:relative;
  width: $width;
  height: $height;
  margin:0 auto;
  overflow:hidden;
}

.content {
  width: $width;
  height: $height;
  background: $color-beta;
  border-radius: 50%;
  padding: 2em;
  overflow: hidden;
  text-align:center;
}

.rotate {
  position: absolute; 
  z-index: 2;
  top: 0;
  right: 0;
  width: $width / 2;
  height: $height;
  box-shadow:0 0 0 .15em $color-alpha;
  background: $color-alpha;
  transform-origin: 0 50%;
  animation: rotate $duration linear 1 forwards;
  animation-delay: $delay;
}

@keyframes rotate {
  0%   { 
    transform: rotate(0deg);
  }
  62% {
    opacity:1;
  }
  99.99% {
    z-index: 2;
  }
  100% { 
    transform: rotate(360deg);
    opacity: 0;
    z-index: -1;
  }
}

.mask {
  position:absolute;
  z-index:1;
  top: -1px;
  left: -1px;
  width: $width + 2px;
  height: $height + 2px;
  background: 
    linear-gradient(top, transparent 50%, $color-alpha 50%),
    linear-gradient(top, $color-alpha 50%, transparent 50%);
  background: 
    linear-gradient(to top, transparent 50%, $color-alpha 50%),
    linear-gradient(to top, $color-alpha 50%, transparent 50%);
  background-position:100% 100%, 0 0;
  background-size: 50% 200%;
  background-repeat: no-repeat;
  border-radius: 50%;
  box-shadow:0 0 0 .65em $color-alpha;
  
  animation: mask $duration / 1.25 linear 1 forwards; 
  animation-delay: (-$duration / 7.5) + $delay;
}

@keyframes mask {
  50% {
    background-position: 100% 0, 0 0;
  }
  
  99.99% {
    z-index: 1;
  }
  
  100% {
    background-position: 100% 0, 0 100%;
    z-index: -1;
  }
}

button {
  display: block;
  width: 7em;
  height: 4em;
  margin: 3em auto 0 auto;
  font-size: 1em;
  border:none;
  background: $color-gamma;
  color:inherit;
  cursor:pointer;
  transition:transform .2s ease-in-out;
  &:hover {
    transform: scale(1.5);
  }
  
  &:active {
    transform: scale(1.5) translateY(5%);
  }
}
            
          
!
            
               /**
  1/2 clock animation

  # What?
  My answer for a question at SO.
  http://stackoverflow.com/questions/14374092/making-div-animate-and-appear-rotating-clockwise-i-e-radialwipe-clock-effect-for

  It's as good as I can do it :(

  Please note: I need to add the wrapper-element because of this bug:
  overflow:hidden + border-radius does not work when transform is added to child
  https://bugs.webkit.org/show_bug.cgi?id=98538

  # 2013 by Tim Pietrusky
  # timpietrusky.com
**/

var button = document.querySelector('button[data-type="restart"]');

/*
 * Restart the animation by clone/delete/addToParent
 * the .wrapper dom element
 */
button.addEventListener('click', function() {
  var elm = document.querySelector('.wrapper'),
      newone = elm.cloneNode(true);

  elm.parentNode.replaceChild(newone, elm);
});

            
          
!
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