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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