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Adding Classes

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About the <head>

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CSS

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JavaScript

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HTML 

              
                <template>
  <div class="avocado">
    <svg viewBox="0 0 135 178">
      <g class="arms" fill="none" stroke="#000" stroke-linecap="round" stroke-width="4">
        <path d="M 30.971627,77.044969 C 1.8442515,59.644207 10.922912,43 10.922912,43"/>
        <path d="M 104.95126,77.044969 C 134.07865,59.644207 125,43 125,43"/>
      </g>
      <g class="feets" fill="none" stroke="#000" stroke-linecap="round" stroke-width="4">
        <path d="m 75.973727,140.56989 c 5.91069,24.01215 -1.10825,35.4641 -1.10825,35.4641 h 11.08253"/>
        <path d="m 54.886437,140.56989 c -5.91069,24.01215 1.10825,35.4641 1.10825,35.4641 h -11.08253"/>
      </g>
      <g class="body">
        <path class="d" fill="none" d="m 129.0419,111.78105 c -3.47383,6.01685 -56.212884,0 -63.160544,0 -6.947659,0 -59.6867121,6.01685 -63.1605421,0 C -0.75301594,105.7642 30.827254,63.099265 34.301084,57.082415 37.774914,51.065566 58.933696,2.3837816 65.881356,2.3837814 c 6.947659,-2e-7 28.10644,48.6817826 31.580269,54.6986326 3.473835,6.01685 35.054105,48.681786 31.580275,54.698636 z"/>        
        <path class="outer" fill="#2a670c" d="M65 5a40 54 0 0 0-40 54 40 54 0 0 0 0 9 50 50 0 0 0-9 30 50 50 0 0 0 49 49 50 50 0 0 0 50-49 50 50 0 0 0-10-30 40 54 0 0 0 1-9A40 54 0 0 0 65 5z"/>
        <path class="inner" fill="#c1e20c" d="M65 12a36 48 0 0 0-36 48 36 48 0 0 0 1 8 44 44 0 0 0-9 26 44 44 0 0 0 44 44 44 44 0 0 0 45-44 44 44 0 0 0-9-26 36 48 0 0 0 0-8 36 48 0 0 0-36-48z"/>
      </g>
      <g class="seed">
        <circle cx="66" cy="93" r="20" fill="#452c0c"/>
        <path fill="#FFF2" d="M107-65a15 15 0 0 1-7 13 15 15 0 0 1-15 0 15 15 0 0 1-7-13" transform="rotate(90)"/>
      </g>
      <g class="face">
        <g class="eye izq">
          <circle cx="58" cy="42" r="6"/>
          <circle cx="56" cy="41" r="3" fill="#fff"/>
        </g>
        <g class="eye der">
          <circle cx="73" cy="42" r="6"/>
          <circle cx="72" cy="41" r="3" fill="#fff"/>
        </g>
        <path d="M73 53a8 8 0 0 1-4 7 8 8 0 0 1-8 0 8 8 0 0 1-4-7"/>
      </g>
    </svg>
  </div>
</template>

<div class="grid"></div>
<div class="waves"></div>

<div class="data">
  <h1>Avocado</h1>
  <div class="music">🎵</div>  
  <h2>#Codevember</h2>
  <a class="ghost" href="https://twitter.com/Manz" target="_blank">Code by Manz</a>
  <a class="ghost" href="https://soundcloud.com/tomdalips/tom-da-lips-avocado-free-download" target="_blank">Music by Tom Da Lips</a>   
</div>

<iframe style="display:none" width="100%" height="300" scrolling="no" frameborder="no" src="https://w.soundcloud.com/player/?url=https%3A//api.soundcloud.com/tracks/324580306&amp;color=%23ff5500&amp;auto_play=true&amp;hide_related=false&amp;show_comments=true&amp;show_user=true&amp;show_reposts=false&amp;show_teaser=true&amp;visual=true"></iframe>
!

CSS 

              
                @import url('https://fonts.googleapis.com/css?family=Montserrat:400,600,800');

.data {
  position:relative;
  z-index:0;
  text-align:center;
  width:400px;
  margin:auto;
  padding:20px;
}

h1, h2, .ghost {
  font-family:Montserrat;
  font-weight:600;  
  margin:0;
}
  
h1 {
  font-weight:800;
  letter-spacing:-2px;
  font-size:64px;
  color:#444;
}

h2 {
  font-size:24px;
  color:#222;
}

.ghost {
  font-weight:400;
  font-size:15px;
  color:#000;
  display:inline-block;
  margin:8px 2px;
  padding:8px;
  border:1px solid #2a670c;
  text-decoration:none;
}

a.ghost:hover {
  transition:all .5s linear;
  background:rgba(50,50,50, .2);
  border-color:#000;
  color:#000;
}

body {
  background:#e4ff93;
  display:flex;
  justify-content:center;
  align-items:center;
  overflow:hidden;
  animation:ambient 4s ease alternate infinite;
}

@keyframes ambient {
  0% { background:#e4ff93 }
  50% { background:#888 }
  100% { background:#98ff93 }
}

.grid {
  display: grid;
  grid-template-columns: 30vw 30vw 30vw;
  justify-items:center;
  align-items:end;
  position:absolute;
  bottom:50px;
  pointer-events:none;  
  z-index:1;
}
.grid .avocado:nth-child(2) svg { width:250px; z-index:5 }

.avocado {
  border-bottom:1px solid #777;
  pointer-events:none;
}

.avocado .body,
.avocado .face,
.avocado .arms {
  transition:all .5s ease;  
}

.avocado svg {
  width:175px;
  transform-origin:50% 100%;
  animation:dancing .5s linear alternate infinite;
  position:relative;
  top:5px;
  pointer-events:none;
}

.avocado.super .d {
  transform:translateY(10px);
  fill:#b2132c;  
}

.avocado.back {
  transform-origin:50% 100%;
  animation:dancing .5s linear alternate infinite;  
}
.avocado.back .inner,
.avocado.back .seed,
.avocado.back .face {
  opacity:0;
}

.dorito .inner,
.dorito .outer,
.dorito .seed {
  opacity:0;
}
.dorito .body,
.dorito .arms,
.dorito .face {
  transform:translateY(35px);
}
.dorito .d {
  fill:#e3c02c;
}

@keyframes dancing {
  0% { transform:skew(-1deg) scaleY(1.025) scaleX(1) }
  50% { transform:skew(0) scaleY(.999) scaleX(1) }
  100% { transform:skew(1deg) scaleY(1.025) scaleX(1) }
}

@keyframes assdancing {
  0% { transform:skew(-2deg) scaleY(1.025) scaleX(.9) }
  50% { transform:skew(0) scaleY(.999) scaleX(1) }
  100% { transform:skew(2deg) scaleY(1.025) scaleX(1.1) }
}

.avocado .eye {
  animation:blink 4s steps(2) infinite;
}

@keyframes blink {
  0%, 49%, 52%, 100% { opacity:1 }
  50% { opacity:0 }
}

.music {
  position:absolute;
  top:15px;
  right:20px;
  color:#000;
  font-size:32px;
  animation:movenote .5s ease alternate infinite;
  z-index:10;
}

@keyframes movenote {
  0% { transform:translate(-10px, -5px) }
  50% { transform:translate(0, 0) }
  100% { transform:translate(10px, -5px) }
}

.waves {
  width:100vw;
  height:350px;
  position:absolute;
  bottom:52px;
  z-index:-1;
  display:flex;
  justify-content:center;
  align-items:flex-end;
}

.bar {
  width:10vw;
  height:100%;
  background:#FFF;
  margin:0 5px;
  transition:height .15s ease;
}
!

JS 

              
                let avocado = document.querySelector('template');
let grid = document.querySelector('.grid');
let waves = document.querySelector('.waves');
let options = ['avocado', 'avocado back', 'super avocado', 'avocado dorito'];

for (let i = 0; i < 3; i++)
  grid.appendChild(avocado.content.cloneNode(true));

for (let i = 0; i < 10; i++) {
  let bar = document.createElement('div');
  bar.className = 'bar';
  waves.appendChild(bar);
}
  
let avocados = document.querySelectorAll('.avocado');
let bars = document.querySelectorAll('.bar');

function change() {
  for (let i = 0; i < avocados.length; i++)
    avocados[i].className = options[~~(Math.random() * options.length)];
}

function updateBars() {
  for (let i = 0; i < bars.length; i++)
    bars[i].style.height = ~~(Math.random() * 100) + '%';
}

setInterval(change, 3000);
setInterval(updateBars, 100 + ~~(Math.random() * 100));
!
999px

Console