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CSS

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Here you can Sed posuere consectetur est at lobortis. Donec ullamcorper nulla non metus auctor fringilla. Maecenas sed diam eget risus varius blandit sit amet non magna. Donec id elit non mi porta gravida at eget metus. Praesent commodo cursus magna, vel scelerisque nisl consectetur et.

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HTML 

            
              <!DOCTYPE html>
<html class="no-js"> 
  <head>
    <meta charset="utf-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <title></title>
    <meta name="description" content="">
    <meta name="viewport" content="width=device-width, initial-scale=1">
    <link rel="stylesheet" href="style.css">
  </head>
  <body>
    <div class="container">
        <ul class="moon">
          <li class="crater"></li>
          <li class="crater"></li>
          <li class="crater"></li>
        </ul>
        <ul class="mountain-range">
          <li class="mountain"></li>
          <li class="mountain"></li>
          <li class="mountain"></li>
          <li class="mountain"></li>
          <li class="mountain"></li>
          <li class="mountain"></li>
          <li class="mountain"></li>
          <li class="mountain"></li>
          <li class="mountain"></li>
          <li class="mountain"></li>
          <li class="mountain"></li>
        </ul>
      <ul class="forest">
        <li class="hill"></li>
        <li class="hill"></li>
        <li class="hill"></li>
      </ul>
      <ul class="sparkles">
          <li class="sparkle one"></li>
          <li class="sparkle one"></li>
          <li class="sparkle one"></li>
          <li class="sparkle one"></li>
          <li class="sparkle two"></li>
          <li class="sparkle two"></li>
          <li class="sparkle two"></li>
          <li class="sparkle two"></li>
          <li class="sparkle three"></li>
          <li class="sparkle three"></li>
          <li class="sparkle three"></li>
          <li class="sparkle three"></li>
          <li class="sparkle four"></li>
          <li class="sparkle four"></li>
          <li class="sparkle four"></li>
          <li class="sparkle four"></li>
          <li class="sparkle five"></li>
          <li class="sparkle five"></li>
          <li class="sparkle five"></li>
          <li class="sparkle five"></li>
          <li class="sparkle six"></li>
          <li class="sparkle six"></li>
          <li class="sparkle six"></li>
          <li class="sparkle six"></li>
          <li class="sparkle seven"></li>
          <li class="sparkle seven"></li>
          <li class="sparkle seven"></li>
          <li class="sparkle seven"></li>
          <li class="sparkle eight"></li>
          <li class="sparkle eight"></li>
          <li class="sparkle eight"></li>
          <li class="sparkle eight"></li>
        </ul>
      <div class="grass">
        <div class="pokemon">
          <div class="poke" id="bulbasaur">
            <div class="ear"></div>
            <div class="ear"></div>
            <div class="head"></div>
            <div class="leg"></div>
            <div class="bulba-body"></div>
            <div class="bulbs">
              <div class="bulb"></div>
            </div>
          </div>
          <div class="poke" id="pikachu">
            <div class="ear"></div>
            <div class="ear"></div>
            <div class="hand"></div>
            <div class="pika-body"></div>
            <div class="head"></div>
            <div class="pika-tail"></div>
          </div>
        </div>
      </div>
    </div>
  </body>
</html>
!

CSS 

            
              $white: #fffaf0;

$sky-fallback: #654ea3; 
$sky-webkit: -webkit-linear-gradient(to bottom, #fcf3d8 30%, #eaafc8, #654ea3); 
$sky: linear-gradient(to top, #fcf3d8 30%, #eaafc8, #654ea3);
$scene-size: 450px;
$num-mountains: 8;
$hill: #82d9a2;

$head-radius-top: 50% 25px;
$head-radius-bottom: 18px;
$bulbasaur-body: darken(#56ffe9, 20%);
$bulb: #00d6ba;
$bulb-dark: darken($bulb, 10%);
$pika-body: #fff069;
$pika-brown: #9c5200;

$moon-size: 75px;

$flight: 15s;
$sparkle-colors: #fffce6, #ffeefc, #f3ffe4, #e9fbff;

@function randomNum($min, $max) {
  $rand: random();
  @return ($min + floor($rand * (($max - $min) + 1)));
}

@mixin head-styles($color) {
  position: absolute;
  width: 60px; 
	height: 45px;
  background-color: $color;
  border-top-left-radius: $head-radius-top;
  border-top-right-radius: $head-radius-top;
  border-bottom-left-radius: $head-radius-bottom;
  border-bottom-right-radius: $head-radius-bottom;
}

@mixin gradient-colors($first, $second, $direction) {
  background: $second;  
  background: -webkit-linear-gradient($direction, $first, $second);  
  background: linear-gradient($direction, $first, $second)
}

@mixin hill-styles($size, $top, $left) {
  $half: $size/2;
  $quarter:  $size/4;
  width: $size;
  height: $half;
  top: $top;
  left: $left;
  border-top-left-radius: $half $quarter;
  border-top-right-radius: $half $quarter;
  border-bottom-left-radius: $half $quarter;
  border-bottom-right-radius: $half $quarter;
  box-shadow: inset 20px 30px 50px darken(#4ca2cd, 15%);
}

@mixin sparkleColor($color) {
  background-color: $color;
  box-shadow: 0px 0px 10px $color;
}

@mixin flight ($aniName, $x, $y) {
  @keyframes #{$aniName} {
    95% {
      opacity: 1;
    }
    100% {
      transform: translate($x, $y) scale(0);
      opacity: 0;
    }
  }
}

@mixin animateSparkles($delay, $start, $end, $ani, $x, $y, $inc, $delta) {
  @include flight($ani, $x, $y);
  @for $i from $start through $end {
    &:nth-child(#{$i}) {
      animation: #{$ani} $flight+$inc $delay infinite;
      $delay: $delay + $delta;
    }
  }
}

body {
  background-color: $white;
}
ul {
  padding: 0;
}
li {
  list-style: none;
}

.container {
  background-image: $sky;
  background-image: $sky-webkit;
  background-color: $sky-fallback;
  height: $scene-size;
  width: $scene-size;
  border-radius: 100%;
  position: absolute;
  transform: translate(-50%, -50%);
  left: 50%;
  top: 50%;
  overflow: hidden;
}

.mountain-range {
  position: absolute;
  width: 100%;
  height: 100px;
  top: 50%;
  display: flex;
  justify-content: center;
  padding: 0;

  .mountain {
    @for $i from 1 through $num-mountains {
      &:nth-child(#{$i}) {
        $mountain-size: randomNum(150px, 200px);
        $margin-top: randomNum(20px, 50px);
        width: 0;
        height: 0;
        margin-top: $margin-top;
        margin-left: -60%;
        border-left: $mountain-size solid transparent;
        border-right: $mountain-size solid transparent;
        border-bottom: $mountain-size/2 solid darken(rgb(168, 212, 255), 10%);
      }
    }
  }
}
.forest {
  position: absolute;
  width: 100%;
  height: 100px;
  top: 65%;
  .hill {
    position: absolute;
    background-color: $hill;
    &:nth-child(1) {
      @include hill-styles(600px, -10px, -150px);
    }
    &:nth-child(2) {
      @include hill-styles(500px, -5px, 100px);
    }
    &:nth-child(3) {
      @include hill-styles(500px, 17px, -180px);
    }
  }
}

.grass {
  position: absolute;
  width: 600px;
  height: 300px;
  border-radius: 300px / 150px;
  top: 75%;
  left: -100px;
  background: $hill;
  box-shadow: inset 20px 30px 60px darken(#4ca2cd, 15%)
}

.pokemon {
  position: absolute;
  width: 300px;
  height: 110px;
  left: calc(53% - 150px);
}

.poke {
  position: absolute;
  width: 100px;
  height: 100px;
}

#bulbasaur {
  &:before {
    content: '';
    position: absolute;
    width: 100px;
    height: 50px;
    background: rgba(#000, .2);
    border-radius: 100%;
    top: 50px;
    left: 15px;
    transform: rotate(-15deg);
  }
  .head {
    @include head-styles($bulbasaur-body);
    left: 55px;
  }
  .ear {
    position: absolute;
    height: 20px;
    width: 23px;
    background-color: $bulbasaur-body;
    border-top-left-radius: 50px 90px;
    border-top-right-radius: 50px 90px;
    transform-origin: center bottom;

    &:nth-child(1) {
      transform: rotate(-45deg);
      left: 52px;
      top: -5px;
      animation: rotateLeftBulbEar 2s alternate infinite;
    }
    &:nth-child(2) {
      transform: rotate(45deg);
      left: 87px;
      top: -5px;
      animation: rotateRightBulbEar 2s alternate infinite;
    }
  }

  .bulba-body {
    position: relative;
    width: 65px;
    height: 55px;
    background-color: $bulbasaur-body;
    left: 42px;
    top: 20px;
    border-radius: 100%;
    box-shadow: inset 10px -10px darken($bulbasaur-body, 4%);
    animation: bodyBreathe 2s alternate infinite;

    &:before,
    &:after {
      content: '';
      position: absolute;
    }
    &:before {
      width: 10px;
      height: 13px;
      top: 33px;
      left: 8px;
      background-color: darken($bulbasaur-body, 8%);
      border-bottom-left-radius: 100%;
      border-bottom-right-radius: 30%;
      border-top-right-radius: 30%;
      border-top-left-radius: 50%;
      transform: rotate(-45deg);
    }
    &:after {
      width: 8px;
      height: 8px;
      top: 30px;
      left: 53px;
      background-color: darken($bulbasaur-body, 4%);
      border-bottom-left-radius: 100%;
      border-bottom-right-radius: 30%;
      border-top-right-radius: 30%;
      border-top-left-radius: 50%;
      transform: rotate(65deg);
    }
  }

  .leg {
    position: absolute;
    width: 20px;
    height: 40px;
    background-color: $bulbasaur-body;
    border-bottom-left-radius: 35px 110%;
    border-bottom-right-radius: 35px 110%;
    box-shadow: inset 10px -20px darken($bulbasaur-body, 5%);
    left: 90px;
    top: 30px;
  }
  .bulbs {
    position: absolute;
    top: -1px;
    width: 55px;
    height: 55px;
    left: 50px;
    transform-origin: center;
    transform: rotate(45deg);
    z-index: 3;
    animation: bulbaBreathe 2s alternate infinite;
    &:before,
    &:after {
      content: '';
      position: absolute;
      height: 45px;
      width: 45px;
      border-radius: 0 50% 50% 50%;
    }
    &:before {
      transform: translate(-5px, 10px) rotate(7deg);
      background-color: darken($bulb-dark, 10%);
    }
    &:after {
      transform: translate(10px, -5px) rotate(-7deg);
      background-color: darken($bulb-dark, 5%);
    }
  }

  .bulb {
    position: absolute;
    top: 10px;
    right: 2px;
    left: 3px;
    width: 90%;
    height: 90%;
    border-radius: 0 50% 100% 50%;
    background-color: $bulb-dark;
    z-index: 4;
    box-shadow: inset 1px -5px darken($bulb-dark, 3%);
  }
}


#pikachu {
  left: -.1em;
  &:before {
    content: '';
    position: absolute;
    width: 60px;
    height: 80px;
    background: rgba(#000, .2);
    border-radius: 100%;
    top: 50px;
    left: 115px;
    transform: rotate(40deg);
  }
  .ear {
    position: absolute;
    height: 40px;
    width: 18px;
    background-color: $pika-body;
    border-top-left-radius: 60px 150px;
    border-top-right-radius: 60px 150px;
    transform-origin: center bottom;
    overflow: hidden;

    &:nth-child(1) {
      transform: rotate(-35deg);
      left: 125px;
      top: -35px;
      animation: rotateLeftEar 1s alternate infinite;

      &:after {
        content: '';
        position: absolute;
        background-color: #444;
        width: 150%;
        height: 15px;
        left: -8px;
        transform: rotate(-30deg)
      }
    }
    &:nth-child(2) {
      transform: rotate(50deg);
      left: 157px;
      top: -30px;
      animation: rotateRightEar 1s alternate infinite;

      &:after {
        content: '';
        position: absolute;
        background-color: #444;
        width: 150%;
        height: 15px;
        left: 2px;
        transform: rotate(30deg);
      }
    }
  }
  .hand {
    position: absolute;
    height: 38px;
    width: 15px;
    background-color: $pika-body;
    border-top-left-radius: 60px 150px;
    border-top-right-radius: 60px 150px;
    transform-origin: center bottom;
    left: 123px;
    top: 5px;
    z-index: 5;
    transform: rotate(-40deg);
    animation: pikaPat .7s alternate infinite;
  }

  .head {
    @include head-styles($pika-body);

    left: 120px;
    width: 60px; 
    height: 55px;
    top: -12px;
    // transform: rotate(10deg);
  }

  .pika-body {
    position: absolute;
    width: 55px;
    height: 55px;
    background-color: $pika-body;
    left: 122px;
    top: 20px;
    border-radius: 22px;

    &:before, 
    &:after {
      content: '';
      position: absolute;
      background-color: $pika-brown;
      width: 70%;
      height: 7px;
      left: 13px;
      border-radius: 100%;
    }

    &:before {
      top: 15px;
      z-index: 2;
    }
    &:after {
      top: 30px;
    }
  }

  .pika-tail {
    position: absolute;
    height: 25px;
    width: 16px;
    background: $pika-brown;
    border-radius: 5px;
    left: 150px;
    top: 40px;
    transform-origin: bottom center;
    transform: rotate(55deg);
    box-shadow: -2px 2px 1px rgba(#444, .2);
    z-index: 2;
    animation: rotateTail 2s alternate infinite;

    &:before,
    &:after {
      content: '';
      transform-origin: bottom center;
      position: absolute;
      background-color: $pika-body;
    }

    &:before {
      height: 1.45rem;
      width: 1.4rem;
      top: -2rem;
      left: 0.25rem;
      transform: rotate(-90deg);
      border: 1px solid $pika-brown;
      border-bottom-right-radius: 5px;
      z-index: 4;
      border-top: 1px solid $pika-body;
    }

    &:after {
      background: $pika-body;
      height: 3rem;
      width: 2rem;
      top: -2.8rem;
      left: -2.5rem;
      border-radius: 5px 5px 0 5px;
      border: 1px solid $pika-brown;

    }
  }
}

.moon {
  position: absolute;
  width: $moon-size;
  height: $moon-size;
  @include gradient-colors(#FFFFFF, #FFEFBA, 135deg);
  border: 5px solid $white;
  top: 10%;
  left: calc(50% - 45px); 
  padding: 0;
  border-radius: 100%;

  li {
    position: absolute;
    border-radius: 100%;
    $dark: darken(#FFEFBA, 8%);
    &:nth-child(1) {
      @include gradient-colors(rgba($white, .1),$dark, 45deg);
      width: 20px;
      height: 20px;
      left: 5px;
      top: 30px;
    }
    &:nth-child(2) {
      @include gradient-colors(rgba($white, .1), $dark, unquote('to left'));
      width: 35px;
      height: 35px;
      left: 35px;
      top: 35px;
    }
    &:nth-child(3) {
      @include gradient-colors(rgba($white, .1), $dark, -120deg);
      width: 25px;
      height: 25px;
      left: 25px;
      top: 5px;
    }
  }
}

.sparkles {
  position: absolute;
  width: 120%;
  height: 190px;
  top: 30%;
  left: -45px;
  .sparkle {
    position: absolute;
    width: 11px;
    height: 11px;
    border-radius: 100%;
    @for $i from 1 through 32 {
      &:nth-child(#{$i}) {
        $index: randomNum(1, 4);
        @include sparkleColor(nth($sparkle-colors, $index));
      }
    }
  }
}

.one {
  left: 0;
  top: 0;
  @include animateSparkles(0s, 1, 4, flyOne, 270px, 75px, 0, 6.44)
}

.two {
  right: 0;
  @include animateSparkles(2.7s, 5, 8, flyTwo, -270px, 75px, 6, 5.3)
}

.three {
  left: 0;
  top: 100%;
  @include animateSparkles(1.4s, 9, 12, flyThree, 270px, -75px, 2, 8.5)
}
.four {
  right: 0;
  top: 100%;
  @include animateSparkles(5.8s, 13, 16, flyFour, -270px, -75px, 10, 4.6)
}

.five {
  left: 0;
  top: 50%;
  @include animateSparkles(8.7s, 17, 20, flyFive, 270px, 0px, 20, 5.7)
}

.six {
  right: 0;
  top: 50%;
  @include animateSparkles(10.6s, 21, 24, flySix, -270px, 0px, 8.5, 4.4)
}

.seven {
  left: 0;
  top: 25%;
  @include animateSparkles(5s, 25, 28, flySeven, 270px, 37px, 14, 7.67)
}

.eight {
  right: 0;
  top: 25%;
  @include animateSparkles(1.6s, 29, 32, flyEight, -270px, 37px, 13.5, 3.74)
}

@keyframes pikaPat {
  from {
    transform: rotate(-40deg);
  }
  to {
    transform: rotate(-50deg);
  }
}
@keyframes rotateTail {
  from {
    transform: rotate(55deg);
  }
  to {
    transform: rotate(65deg);
  }
}
@keyframes rotateLeftEar {
  from {
    transform: rotate(-35deg);
  }
  to {
    transform: rotate(-40deg);
  }
}
@keyframes rotateRightEar {
  from {
    transform: rotate(50deg);
  } 
  to {
    transform: rotate(60deg);
  }
}
@keyframes bulbaBreathe {
  from {
    transform: rotate(45deg) scale(1);
  }
  to {
    transform: rotate(45deg) scale(1.01);
  }
}
@keyframes bodyBreathe {
  from {
    transform: scale(1);
  } 
  to {
    transform: scale(1.05);
  }
}
@keyframes rotateLeftBulbEar {
  from {
    transform: rotate(-45deg);
  }
  to {
    transform: rotate(-55deg);
  }
}
@keyframes rotateRightBulbEar {
  from {
    transform: rotate(45deg);
  }
  to {
    transform: rotate(55deg);
  }
}
!

JS 

            
              // Reference image: https://twitter.com/BulbaGanda/status/1163627358303264768
!
999px

Console