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CSS

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HTML 

              
                
<div class="monster">

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   preserveAspectRatio="xMidYMid meet">
    <g transform="translate(0.000000,174.000000) scale(0.100000,-0.100000)"
  fill="#000000" stroke="none">
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  </g>
  </svg>
  
</div>

<div class="monster">

  <svg version="1.0" xmlns="http://www.w3.org/2000/svg"
   width="124.000000pt" height="174.000000pt" viewBox="0 0 124.000000 174.000000"
   preserveAspectRatio="xMidYMid meet">
    <g transform="translate(0.000000,174.000000) scale(0.100000,-0.100000)"
  fill="#000000" stroke="none">
  <path d="M0 870 l0 -870 620 0 620 0 0 870 0 870 -620 0 -620 0 0 -870z m745
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  </g>
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</div>

<div class="monster">

  <svg version="1.0" xmlns="http://www.w3.org/2000/svg"
   width="124.000000pt" height="174.000000pt" viewBox="0 0 124.000000 174.000000"
   preserveAspectRatio="xMidYMid meet">
    <g transform="translate(0.000000,174.000000) scale(0.100000,-0.100000)"
  fill="#000000" stroke="none">
  <path d="M0 870 l0 -870 620 0 620 0 0 870 0 870 -620 0 -620 0 0 -870z m745
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  </g>
  </svg>
  
</div>
!

CSS 

              
                @import "compass/css3";

$color-alpha: #000;
$color-beta: #0c0;
$color-gamma: #c00;
$color-delta: #cc0;

$unit-alpha: 1.15s;
$unit-beta: 1s;
$unit-gamma: $unit-beta + -.3s;
$unit-delta: $unit-beta + .3s;
$unit-epsilon: $unit-alpha * 1.85;
$unit-zeta: .25em;

@mixin monster-background($color) {
  background-color: $color-alpha;
  
  background-image:     
    radial-gradient(circle, rgba(255, 255, 255, .45) 25%, transparent 30%),
    linear-gradient(to top, $color-alpha, $color-alpha 50%, darken($color, 35%) 50%, lighten($color, 15%) 100%);
  
  @include background(
    radial-gradient(circle, rgba(255, 255, 255, .45) 25%, transparent 30%),
    linear-gradient(bottom, $color-alpha, $color-alpha 50%, darken($color, 35%) 50%, lighten($color, 15%) 100%)
  );
  background-size: 100% 300%, 100% 200%;
  background-position: 100% 100%, 100% 100%;
}

body {
  background: $color-alpha;
}

.monster {
  position: absolute;
  left: 50%;
  top: 50%;
  display: inline-block;
  height: 168pt;
  width: 120pt;
  animation: 
    alpha $unit-alpha 1 linear forwards $unit-beta,
    gamma $unit-epsilon infinite linear forwards ($unit-epsilon)
  ;
  
  @include transform(scale(1.25, 1.25) translate(-50%, -45%));
  @include monster-background($color-beta);
  @include transition(background .15s ease-in-out);
  @include backface-visibility(hidden);
  
  &:hover {
    animation: beta $unit-alpha 1 linear forwards $unit-beta;
    @include monster-background($color-alpha);
  }
  
  &:nth-child(2) {
    @include transform(scale(1, 1) translate(-200%, -50%));
    @include monster-background($color-gamma);
    animation: 
      alpha $unit-alpha 1 linear forwards $unit-gamma,
      gamma $unit-epsilon infinite linear forwards ($unit-epsilon + $unit-delta)
    ;
    
    &:hover {
      animation: beta $unit-alpha 1 linear forwards $unit-beta;
      @include monster-background($color-alpha);
    }
  }
  
  &:nth-child(3) {
    @include transform(scale(.75, .75) translate(100%, -60%));
    @include monster-background($color-delta);
    animation: 
      alpha $unit-alpha 1 linear forwards $unit-delta,
      gamma $unit-epsilon infinite linear forwards ($unit-epsilon + $unit-gamma)
    ;
    
    &:hover {
      animation: beta $unit-alpha 1 linear forwards $unit-beta;
      @include monster-background($color-alpha);
    }
  }
}

@keyframes alpha {
  0% {
    margin-top: -.5em;
    background-position: 100% 100%, 100% 100%;
  }
  
  70% {
    background-position: 100% 100%, 100% 85%;
  }
  
  75% {
    @include filter(blur(0));
  }
  
  80% {
    margin-top: -.5em;
  }
  
  85% {
    margin-top: $unit-zeta;
    @include filter(blur(5px));
  }
  
  100% {
    background-position: 100% 0, 100% 0%;
    margin-top: $unit-zeta;
    @include filter(blur(0));
  }
}

@keyframes beta {}

@keyframes gamma {
  0% {
    background-position: 100% 100%, 100% 0;
  }

  90% {
    opacity: .15; 
    background-position: 100% 100%, 100% 0;
    @include filter(blur(0));
  }
  
  95% {
    opacity: 1;
    @include filter(blur(5px));
  }
  
  100% {
    background-position: 100% 0, 100% 0;
    @include filter(blur(0));
  }
}
!

JS 

              
                /*
 * Monster Energy SVG logo animated
 *
 * A simple animation for the monsterenergy.com logo.
 * Why? I love Monster Energy drinks. 
 * Just :hover to reset the animation. 
 *
 * 
 * You can support this with a vote:
 *
 * Reddit
 http://www.reddit.com/r/web_design/comments/1hxcw1/monster_energy_logo_as_svg_and_animated_with_css/
 *
 * Hacker News
 * https://news.ycombinator.com/item?id=6012419
 *
 * This is a fan remake. Please don't sue me!
 *
 * 
 * 2013 by Tim Pietrusky
 * timpietrusky.com
 */
!
999px

Console