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CSS

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HTML 

              
                <div class="stars_wrap">
  <div class="star_bg">
    <div class="star_inner" style="background-color: rgb(255, 255, 255);"></div>
  </div>
  <div class="star_bg">
    <div class="star_inner" style="background-color: rgb(255, 255, 255);"></div>
  </div>
  <div class="star_bg">
    <div class="star_inner" style="background-color: rgb(255, 255, 255);"></div>
  </div>
  <div class="star_bg">
    <div class="star_inner" style="background-color: rgb(255, 255, 255);"></div>
  </div>
  <div class="star_bg">
    <div class="star_inner" style="background-color: rgb(255, 255, 255);"></div>
  </div>
  <div class="star_bg">
    <div class="star_inner" style="background-color: rgb(255, 255, 255);"></div>
  </div>
</div>

<div class="wrap">
  <button class="switch">Put the mask on</button>

  <div class="girl">
    <div class="hair"></div>

    <div class="head">
      <div class="eye left"></div>
      <div class="eye right"></div>
    </div>

    <div class="body"></div>

    <div class="leg left"></div>
    <div class="leg right"></div>

    <div class="mask">
      <div class="star"></div>
    </div>

    <div class="hand left"></div>
    <div class="hand right"></div>

    <div class="fringe"></div>
  </div>
</div>
!

CSS 

              
                * {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

body {
  width: 100vw;
  height: 100vh;
  background: #90caf9;
  transition: all 3s;
  overflow: hidden;
}

// bg stars
.star_bg {
  position: absolute;
  top: 0;
  right: 0;
  bottom: 0;
  left: 0;
  height: 55px;
  width: 55px;
  margin: auto;
  opacity: 0;
  cursor: pointer;
  color: #fff;
  -webkit-tap-highlight-color: rgba(0, 0, 0, 0);
  transform: translate3d(0,0,0) scale(1);
  
  &.active::before {
    background: #ffe082;
  }

  .star_inner {
    display: block;
    width: 100%;
    height: 100%;
    background-color: rgb(255, 255, 255);
    .mxn_star();
  transform: translateZ(0);
  }
}

.wrap {
  position: absolute;
  top: 0;
  right: 0;
  bottom: 0;
  left: 0;
  width: 170px;
  height: 240px;
  margin: auto;
  cursor: pointer;
  -webkit-tap-highlight-color: rgba(0, 0, 0, 0);
  transform: translateZ(0);
}

.switch {
  position: absolute;
  bottom: 100%;
  left: 50%;
  height: 35px;
  padding: 0 15px;
  background: #673ab7;
  outline: none;
  border: none;
  border-radius: 3px;
  -webkit-tap-highlight-color: rgba(0, 0, 0, 0);
  cursor: pointer;
  color: #fff;
  text-transform: uppercase;
  font-weight: bold;
  transform: translateX(-50%);
  white-space: nowrap;
  font-size: 16px;
  line-height: 35px;

  &:hover {
    background: darken(#673ab7, 10%);
  }
}

// girl
.girl {
  position: relative;
  width: 100%;
  height: 100%;
  filter: drop-shadow(0 0 5px fade(#fff, 1%));
  transform: translateZ(0);
}

/* girl */
.hair {
  position: absolute;
  top: 7px;
  right: 15px;
  width: 140px;
  height: 180px;
  border-radius: 70px 70px 10px 10px;
  margin: auto;
  background: #212121;
  transform-origin: 70px 70px;
  transform: translateZ(0);
}

.head {
  position: absolute;
  top: 20px;
  left: 0;
  right: 0;
  height: 120px;
  width: 120px;
  margin: auto;
  border-radius: 50%;
  background: #ffe082;
}

.eye {
  position: absolute;
  top: 25px;
  width: 45px;
  height: 45px;
  border-radius: 50%;
  background: #fff;
  overflow: hidden;

  &::before {
    content: "";
    position: absolute;
    top: 6px;
    right: 0;
    left: 0;
    width: 40px;
    height: 40px;
    margin: auto;
    border-radius: 50%;
    background: #212121;
  }

  &.left {
    left: 10px;
  }

  &.right {
    right: 10px;
  }
}

.body {
  position: absolute;
  top: 150px;
  right: 0;
  left: 0;
  width: 50px;
  height: 90px;
  margin: auto;
  background: #673ab7;
  border-radius: 10px;
}

.leg {
  position: absolute;
  top: 250px;
  width: 20px;
  height: 90px;
  background: #212121;
  border-radius: 5px;

  &.left {
    left: 60px;
  }

  &.right {
    right: 60px;
  }
}

.mask {
  position: absolute;
  top: 150px;
  left: 0;
  right: 0;
  height: 120px;
  width: 120px;
  overflow: hidden;
  margin: auto;
  border-radius: 50%;
  background: #fff;
  // webkit
  -webkit-mask-image: radial-gradient(
      circle at 33px 47px,
      transparent,
      transparent 21px,
      #fff 22px
    ),
    radial-gradient(
      circle at 27px 47px,
      transparent,
      transparent 21px,
      #fff 22px
    );
  -webkit-mask-size: 50% 100%;
  -webkit-mask-repeat: no-repeat;
  -webkit-mask-position: 0 0, 100% 0;
  -webkit-mask-mode: luminance;
  // other
  mask-image: radial-gradient(
      circle at 33px 47px,
      transparent,
      transparent 21px,
      #fff 22px
    ),
    radial-gradient(
      circle at 27px 47px,
      transparent,
      transparent 21px,
      #fff 22px
    );
  mask-size: 50% 100%;
  mask-repeat: no-repeat;
  mask-position: 0 0, 100% 0;
  mask-mode: luminance;
  transform: translateZ(0);
}

.star {
  position: absolute;
  top: 11px;
  left: -4px;
  height: 75px;
  width: 75px;
  background: #212121;
  .mxn_star();
  transform: translateZ(0);
}

.hand {
  position: absolute;
  top: 200px;
  width: 30px;
  height: 30px;
  background: #ffe082;
  border-radius: 50%;

  &.left {
    left: 10px;
  }

  &.right {
    right: 10px;
  }
}

.fringe {
  position: absolute;
  top: 18px;
  right: 0;
  left: 0;
  width: 100px;
  height: 27px;
  margin: auto;
  background: #212121;
  border-radius: 40px 40px 20px 20px;
}

.starchild {
  background: #212121;

  .wrap {
    transform: translateY(-50px);
    cursor: default;
    transition: all 2s 3s;
  }

  .switch {
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.2s;
  }

  .girl {
    filter: drop-shadow(0 0 20px #fff);
    transition: all 1s 2s;
    animation: ani_floating 2s 3s ease-in-out alternate infinite;
  }
  .hair {
    height: 300px;
    transition: all 1s 2s ease-in;
  }
  .mask {
    animation: ani_move 2s ease-out forwards;
  }
  .hand {
    animation: ani_move 2s ease-out alternate 2;
  }
  .star {
    animation: ani_rotate 3s linear infinite;
  }
  .eye::before {
    transform: translateY(-3px);
    transition: all 0.2s 2s;
  }
  
  .star_bg {   
    opacity: 1;
    transition: all 1s 3s ease-in;
    
    &:nth-child(1) { transform: translate3d(-150px,-150px,0) scale(1); }
    &:nth-child(2) { transform: translate3d(-200px,0,0) scale(1); }
    &:nth-child(3) { transform: translate3d(-150px,150px,0) scale(1); }
    &:nth-child(4) { transform: translate3d(150px,-150px,0) scale(1); }
    &:nth-child(5) { transform: translate3d(200px,0,0) scale(1); }
    &:nth-child(6) { transform: translate3d(150px,150px,0) scale(1); }
    
    .star_inner {
      animation: ani_rotate 2s linear infinite;
    }
    
    &:nth-child(1) .star_inner { animation-delay: .1s; }
    &:nth-child(2) .star_inner { animation-delay: .3s; }
    &:nth-child(3) .star_inner { animation-delay: .2s; }
    &:nth-child(4) .star_inner { animation-delay: .4s; }
    &:nth-child(5) .star_inner { animation-delay: .6s; }
    &:nth-child(6) .star_inner { animation-delay: .5s; }
  }
}

@keyframes ani_floating {
  from {
    transform: translateY(0);
  }
  to {
    transform: translateY(-20px);
  }
}

@keyframes ani_rotate {
  from {
    transform: rotate(0deg);
  }
  to {
    transform: rotate(360deg);
  }
}

@keyframes ani_move {
  from {
    transform: translateY(0);
  }
  to {
    transform: translateY(-130px);
  }
}

.mxn_star {
  -webkit-clip-path: polygon(
    50% 0%,
    66% 28%,
    98% 35%,
    76% 59%,
    79% 91%,
    50% 76%,
    21% 91%,
    25% 60%,
    2% 35%,
    34% 28%
  );
  clip-path: polygon(
    50% 0%,
    66% 28%,
    98% 35%,
    76% 59%,
    79% 91%,
    50% 76%,
    21% 91%,
    25% 60%,
    2% 35%,
    34% 28%
  );
  transform-origin: 50% 48%;
}
!

JS 

              
                let btn = document.querySelector('.wrap');
let body = document.querySelector('body');
let stars = document.querySelectorAll('.star_inner');
let colors = ['rgb(255, 255, 255)','rgb(127, 140, 141)','rgb(149, 165, 166)','rgb(189, 195, 199)','rgb(192, 57, 43)','rgb(231, 76, 60)','rgb(211, 84, 0)','rgb(230, 126, 34)','rgb(243, 156, 18)','rgb(241, 196, 15)'];

btn.addEventListener('click',() => {
  body.classList.add('starchild');
});

for (let star of stars){
  star.addEventListener('click',function(){
    this.style.backgroundColor = randomColor(this.style.backgroundColor);
  });
}

function randomColor(pOld){
  let colorOld = pOld;
  let colorNew = colors[Math.floor(Math.random() * colors.length)];
  
  if (colorOld === colorNew) { return randomColor(colorOld); }
  else { return colorNew; }
}
!
999px

Console