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HTML 

              
                .frank-einstein-monster
  .head
    .hair
      .bangs
    .staples
      each staple in [1, 2, 3, 4]
        div(class="staple staple" + staple)
    .scar
    .eyes
      .left
      .right
    .ears
    .tongue
    .moustache
      .center-hairs
        each hair in [1, 2, 3, 4]
          .hair
    .nose
    .terminals
      .left
      .right
  .head-shadow
.sign e = m*c²
  br
  | (experiments = monstrous code squared)
!

CSS 

              
                $black: #282828;
$dark-purple: #361d2e;
$electric-blue: #2c75ff;
$gold: #ac7906;
$grey: #cbc0ad;
$pink: #ef7d94;
$white: #eee;
$yellow: #e3ba59;





* {
  box-sizing: border-box;
  position: relative;

  &::after,
  &::before {
    box-sizing: border-box;
    content: "";
    position: absolute;
  }
}

@mixin size($w: 100%, $h: 100%) {
  height: $h;
  width: $w;
}

body {
  @include size(100vw, 100vh);
  align-items: center;
  background-color: $dark-purple;
  display: flex;
  justify-content: center;
  margin: 0;
  overflow: hidden;
}

.frank-einstein-monster {
  @include size(50vmin, 50vmin);
  align-items: center;
  color: $yellow;
  display: flex;
  flex-direction: column;
  justify-content: center;
}

.head {
  @include size(40vmin);
  animation: 8s ease-in-out infinite levitate;
  background-image: radial-gradient(ellipse farthest-corner, currentColor, mix($yellow, $black, 90%) );
  border-radius: 1vmin;

  %side-hair {
    @include size(8%);
    background-color: currentColor;
  }

  &>.hair {
    @include size($h: 40%);
    border-top: 1.4vmin solid $white;
    border-radius: 1vmin 1vmin 0 0;
    color: $white;
    position: absolute;

    &::after { /* left side hair */
      @extend %side-hair;
      border-bottom-right-radius: 80%;
    }

    &::before { /* right side hair */
      @extend %side-hair;
      border-bottom-left-radius: 80%;
      right: 0;
    }

    .bangs {
      @include size(50%, 200%);
      background-color: currentColor;
      clip-path: polygon(0% 0%, 5% 10%, 10% 3%, 14% 13%, 21% 2%, 22% 27%, 30% 2%, 38% 29%, 43% 2%, 48% 16%, 52% 3%, 54% 22%, 57% 3%, 62% 9%, 66% 1%, 72% 20%, 73% 2%, 79% 9%, 80% 3%, 86% 13%, 89% 3%, 93% 10%, 99% 0%);
      left: calc(50% - 25%);
      position: absolute;
    }
  }
}

.staples {
  @include size($h: 12%);
  position: absolute;

  .staple {
    background-image: linear-gradient(to right, $gold, lighten($gold, 5%), $gold);
    clip-path: polygon(0% 0%, 8% 100%, 83% 100%, 100% 0%);
    position: absolute;

    &1 {
      @include size(8%);
      left: 9%;
    }

    &2 {
      @include size(4%, 60%);
      left: 21%;
    }

    &3 {
      @include size(6%, 90%);
      right: 8%;
    }

    &4 {
      @include size(5%, 80%);
      right: 20%;
    }
  }
}

@function repeat-stitches($n, $offset-y, $color) {
  $stitches: ();
  @for $i from 1 through $n {
    $stitches: $stitches, 0 $offset-y*$i 0 0 $color;
  }

  @return $stitches;
}

.scar {
  @include size(.4vmin, 15%);
  background-color: darken($yellow, 50%);
  border-radius: 100%;
  left: 18%;
  position: absolute;
  top: 12%;
  transform: rotateZ(-30deg);

  &::before { /* stitches */
    @include size(550%, .3vmin);
    background-color: $white;
    box-shadow: repeat-stitches(4, 1.5vmin, $white);
    left: calc(-275% + .2vmin);
    top: 10%;
  }
}

.eyes {
  @include size(100%, 6vmin);
  position: absolute;
  top: 35%;

  %eye {
    @include size(6vmin);
    background-color: $white;
    border: .4vmin solid $black;
    border-radius: 100%;
    position: absolute;

    &::after { /* eyebrown */
      @include size(120%, 40%);
      background-color: transparentize($black, .1);
      filter: blur(.1px);
      top: -60%;
    }

    &::before { /* pupil */
      @include size(25%, 25%);
      background-color: $black;
      border-radius: 100%;
      left: calc(50% - 12.5%);
      top: calc(50% - 12.5%);
    }
  }

  .left {
    @extend %eye;
    left: calc(33% - 3vmin);
    
    &::after {
      animation: 14s ease-in-out 2.4s infinite eyebrowns-game-left;
      transform: skew(-10deg) rotateZ(-10deg) translateX(-20%);
    }
  }
  .right {
    @extend %eye;
    right: calc(33% - 3vmin);

    &::after {
      animation: 14s ease-in-out 2.4s infinite eyebrowns-game-right;
      transform: skew(10deg) rotateZ(10deg) translateX(10%);
    }
  }
}

.ears {
  @include size(118%, 22%);
  background-image: radial-gradient(ellipse farthest-corner, currentColor, mix($yellow, $black, 90%) );
  border-radius: 4vmin 3vmin 5vmin 4vmin;
  left: -9%;
  mix-blend-mode: color;
  position: absolute;
  top: 40%;
  z-index: -1;

  &::before { /* left inner ear */
    @include size(6%, 60%);
    background-color: transparentize(mix($yellow, $black, 50%), .6);
    border-radius: 100%;
    left: 2%;
    top: 20%;
    transform: rotateZ(-8deg);
  }

  &::after { /* right inner ear */
    @include size(6%, 60%);
    background-color: transparentize(mix($yellow, $black, 50%), .6);
    border-radius: 100%;
    right: 2%;
    top: 20%;
    transform: rotateZ(8deg);
  }
}

.nose {
  @include size(26%, 25%);
  background-color: $yellow;
  border-top-color: transparent;
  border-radius: 100%;
  box-shadow: inset .6vmin -.6vmin .2vmin 0 mix($yellow, $black, 50%), inset -.6vmin -.6vmin .2vmin 0 mix($yellow, $black, 50%);
  left: calc(50% - 13%);
  top: calc(35% + 5vmin);
}

.moustache {
  @include size(70%, 30%);
  align-items: center;
  animation: 14s ease-in-out infinite shake-moustache;
  color: $white;
  display: flex;
  justify-content: center;
  left: 15%;
  position: absolute;
  top: 57%;

  &::after { /* left side */
    @include size(15%);
    background-color: currentColor;
    border-radius: 5vmin 100%;
    transform: rotateZ(45deg);
    transform-origin: top center;
  }

  &::before { /* right side */
    @include size(15%);
    background-color: currentColor;
    border-radius: 5vmin 100%;
    transform: rotateZ(-45deg);
    transform-origin: top center;
  }

  .center-hairs {
    @include size(60%, 40%);
    align-items: center;
    display: flex;
    justify-content: center;

    .hair {
      @include size(20%);
      background-color: currentColor;
      border-radius: 5vmin 100%;
    }
  }
}

.tongue {
  @include size(18%, 22%);
  animation: 14s ease-in-out infinite tongue-out;
  background-color: $pink;
  border-radius: 0 0 100% 100%;
  left: calc(50% - 9%);
  position: absolute;
  top: 58%;
  transform-origin: top center;

  &::before { /* tongue line */
  @include size(8%, 50%);
    background-color: mix($pink, $black, 90%);
    background-image: radial-gradient(ellipse farthest-corner, mix($pink, $black, 80%), $pink);
    border-radius: 100%;
    left: calc(50% - 4%);
    top: 25%;
  }
}

.terminals {
  @include size(100%, 8%);
  align-items: center;
  bottom: 10%;
  display: flex;
  justify-content: space-between;
  position: absolute;

  %terminal {
    @include size(15%);
    background-image: linear-gradient(to bottom, $grey, $white, $grey);

    &::before {
      @include size(25%, 120%);
      background-image: linear-gradient(to bottom, $grey, $white, $grey);
      top: -10%;
    }
  }

  .left {
    @extend %terminal;
    left: -15%;

    &::before {
      border-radius: 50% 0 0 50%;
      box-shadow: inset -.4vmin 0 0 0 mix($grey, $black, 90%);
      left: -25%;
    }
  }

  .right {
    @extend %terminal;
    right: -15%;

    &::before {
      border-radius: 0 50% 50% 0;
      box-shadow: inset .4vmin 0 0 0 mix($grey, $black, 90%);
      right: -25%;
    }
  }
}

.head-shadow {
    @include size(32vmin, 4vmin);
    animation: 8s ease-in-out infinite shadow;
    background-color: darken($dark-purple, 5%);
    bottom: -20%;
    border-radius: 100%;
}

.sign {
  bottom: 1vmin;
  color: $white;
  font-family: 'Fredericka the Great', cursive;
  font-size: 2rem;
  left: 0;
  position: absolute;
  text-align: center;
  width: 100vw;
}


/* Animation */

@keyframes tongue-out {
  0%, 2%, 19% { transform: translateY(0); }
  4% { transform: translateY(75%); }
  9% { transform: translateY(75%) rotateZ(25deg); }
  14% { transform: translateY(75%) rotateZ(-25deg); }
}

@keyframes shake-moustache {
  0%, 2%, 19% { transform: rotateZ(0); }
  4%, 14% { transform: rotateZ(-2deg); }
  9% { transform: rotateZ(2deg); }
}

@keyframes eyebrowns-game-left {
  0%, 10%, 14%, 18% { transform: skew(-10deg) rotateZ(-10deg) translateX(-20%) translateY(0); }
  12%, 16% { transform: skew(-10deg) rotateZ(-10deg) translateX(-20%) translateY(-30%); }
}

@keyframes eyebrowns-game-right {
  0%, 10%, 14%, 18% { transform: skew(10deg) rotateZ(10deg) translateX(10%) translateY(0); }
  12%, 16% { transform: skew(10deg) rotateZ(10deg) translateX(10%) translateY(-30%); }
}

@keyframes levitate {
  0%, 50%, 100% { transform: translateY(3%); }
  25%, 75% { transform: translateY(-3%) ;}
}

@keyframes shadow {
  0%, 50%, 100% { transform: scale(1.05) rotateX(45deg); }
  25%, 75% { transform: scale(.95) rotateX(45deg); }
}
!

JS
!
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