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HTML 

              
                <div class="minifigure">
  <div class="head">
    <div class="faces-wrap">
      <div class="faces">
        <div class="face classic">
          <div class="eye right"></div>
          <div class="eye left"></div>
          <div class="mouth"></div>
        </div>

        <div class="face smile">
          <div class="eye right">
            <div class="brow"></div>
          </div>
          <div class="eye left">
            <div class="brow"></div>
          </div>
          <div class="mouth"></div>
        </div>

        <div class="face large-smile">
          <div class="eye right">
            <div class="brow"></div>
          </div>
          <div class="eye left">
            <div class="brow"></div>
          </div>
          <div class="mouth"></div>
        </div>

        <div class="face worried">
          <div class="eye right">
            <div class="brow"></div>
          </div>
          <div class="eye left">
            <div class="brow"></div>
          </div>
          <div class="mouth"></div>
        </div>

        <div class="face frown">
          <div class="eye right">
            <div class="brow"></div>
          </div>
          <div class="eye left">
            <div class="brow"></div>
          </div>
          <div class="mouth"></div>
        </div>

        <div class="face surprised">
          <div class="eye right">
            <div class="brow"></div>
          </div>
          <div class="eye left">
            <div class="brow"></div>
          </div>
          <div class="mouth"></div>
        </div>
      </div>
    </div>
  </div>
  <div class="upper-body">
    <div class="torso"></div>
    <div class="arm right">
      <div class="hand right"></div>
    </div>
    <div class="arm left">
      <div class="hand left"></div>
    </div>
  </div>
  <div class="lower-body">
    <div class="waist"></div>
    <div class="crotch"></div>
    <div class="leg right"></div>
    <div class="leg left"></div>
  </div>
</div>

<div class="controls">
  <h2 class="title">Controls</h2>
  
  <button class="button explode">Explode</button>
  <button class="button randomize">Randomize</button>
  
  <fieldset class="head-expression">
    <legend>Head</legend>
    
    <div class="form-element">
      <label for="expression">Expression</label>
      <input id="expression" class="expression-range expression" name="expression" type="range" min="0" max="500" step="100" value="0">
    </div>
  </fieldset>
  
  <fieldset class="upper-color">
    <legend>Upper Body</legend>
    
    <div class="form-element">
      <label for="upper-hue">Hue</label>
      <input id="upper-hue" class="color-range upper-hue" name="upper-hue" type="range" min="0" max="360" value="200">
    </div>
    
    <div class="form-element">
      <label for="upper-saturation">Saturation</label>
      <input id="upper-saturation" class="color-range upper-saturation" name="upper-saturation" type="range" min="0" max="100" value="0">
    </div>
    
    <div class="form-element">
      <label for="upper-lightness">Lightness</label>
      <input id="upper-lightness" class="color-range upper-lightness" name="upper-lightness" type="range" min="0" max="90" value="90">
    </div>
  </fieldset>
  
  <fieldset class="lower-color">
    <legend>Lower Body</legend>
    
    <div class="form-element">
      <label for="lower-hue">Hue</label>
      <input id="lower-hue" class="color-range lower-hue" name="lower-hue" type="range" min="0" max="360" value="200">
    </div>
    
    <div class="form-element">
      <label for="lower-saturation">Saturation</label>
      <input id="lower-saturation" class="color-range lower-saturation" name="lower-saturation" type="range" min="0" max="100" value="0">
    </div>
    
    <div class="form-element">
      <label for="lower-lightness">Lightness</label>
      <input id="lower-lightness" class="color-range lower-lightness" name="lower-lightness" type="range" min="0" max="90" value="90">
    </div>
  </fieldset>
</div>
!

CSS 

              
                html {
  box-sizing: border-box;
}

*,
*::before,
*::after {
  box-sizing: inherit;
  padding: 0;
  margin: 0;
}

body {
  display: flex;
  height: 100vh;
  font-family: Montserrat, sans-serif;
}

.minifigure {
  position: relative;
  width: 300px;
  height: 485px;
  margin: auto;
  perspective: 200;
  transform-style: preserve-3d;
  transition: transform 400ms;
}

.minifigure.explode {
  transform: scale(0.75) translateZ(0);
}

/* Head */

.head {
  position: absolute;
  z-index: 2;
  top: 2.25em;
  left: 50%;
  width: 7.25em;
  height: 6.25em;
  transform: translateX(-50%);
  color: hsla(50,90%,50%,1);
  background-color: currentColor;
  background-image:
    linear-gradient(
      rgba(255,255,255,0.3),
      rgba(255,255,255,0) 20%,
      rgba(0,0,0,0) 80%,
      rgba(0,0,0,0.15) 95%,
      rgba(0,0,0,0.3)
    ),
    linear-gradient(
      to right,
      rgba(255,255,255,0) 50%,
      rgba(255,255,255,0.2),
      rgba(255,255,255,0)
    );
  border-radius: 1.5em;
  transition: transform 400ms;
}

.explode .head {
  transform: translate(-50%, -8em);
}

.head::before,
.head::after {
  content: '';
  position: absolute;
  left: 50%;
  height: 2em;
  transform: translateX(-50%);
  background-color: currentColor;
}

.head::before {
  top: -1.25em;
  width: 3.5em;
  height: 1.25em;
  background-image:
    linear-gradient(
      rgba(255,255,255,0.5),
      rgba(255,255,255,0) 30%
    ),
    linear-gradient(
      to right,
      rgba(255,255,255,0) 70%,
      rgba(255,255,255,0.25) 80%,
      rgba(255,255,255,0) 90%
    );
  border-radius: 0.25em 0.25em 0 0;
}

.head::after {
  bottom: -0.875em;
  width: 4.5em;
  height: 1em;
  background-image:
    linear-gradient(
      rgba(0,0,0,0.2),
      rgba(0,0,0,0.05) 50%
    ),
    linear-gradient(
      to right,
      rgba(255,255,255,0) 70%,
      rgba(255,255,255,0.25) 80%,
      rgba(255,255,255,0) 90%
    );
  border-radius: 0 0 0.125em 0.125em;
}

/* Faces */

.faces-wrap {
  height: 100%;
  overflow: hidden;
}

.faces {
  display: flex;
  transition: transform 400ms cubic-bezier(0,0,0,1.25);
}

.explode .faces {
  transform: translateX(-500%) !important;
}

.face {
  position: relative;
  flex: 1 0 100%;
}

/* Eyes */

.eye {
  position: absolute;
  top: 2.25em;
  width: 0.75em;
  height: 0.9375em;
  color: #fff;
  background-color: currentColor;
  border-radius: 50%;
  box-shadow: inset 0 -0.125em 0 0.25em #000;
}

.eye::before {
  content: '';
  position: absolute;
  left: 50%;
  color: #000;
  transform: translateX(-50%);
}

.eye.right {
  left: 2.25em;
}

.eye.left {
  right: 2.25em;
}

.classic .eye {
  top: 2.4375em;
  height: 0.75em;
  color: #000;
  box-shadow: none;
}

.large-smile .eye {
  top: 2em;
}

.worried .eye,
.surprised .eye {
  top: 2.4375em;
  width: 1em;
  height: 1.125em;
  box-shadow: inset 0 -0.125em 0 0.3125em #000;
}

.worried .eye.right {
  left: 2.125em;
}

.worried .eye.left {
  right: 2.125em;
}

.frown .eye {
  top: 2.625em;
}

.frown .eye::before {
  bottom: 80%;
  width: 1.25em;
  height: 1em;
  border: 0.1875em solid transparent;
  border-bottom-color: currentColor;
  border-radius: 50%;
}

.frown .eye.right::before {
  margin-left: -0.25em;
  transform: translateX(-50%) rotate(-20deg);
}

.frown .eye.left::before {
  margin-left: 0.25em;
  transform: translateX(-50%) rotate(20deg);
}


/* Brow */

.brow {
  position: absolute;
  bottom: 0.625em;
  left: 50%;
  width: 1.75em;
  height: 1em;
  transform-origin: 0 0;
  transform: translateX(-50%);
  color: #000;
  border: 0.25em solid transparent;
  border-top-color: currentColor;
  border-bottom: none;
  border-radius: 50% 50% 0 0;
}

.right .brow {
  border-left: none;
}

.left .brow {
  border-right: none;
}

.large-smile .brow {
  bottom: 0.375em;
  width: 1.25em;
  height: 1.375em;
  border: none;
  border-top: 0.25em solid;
  border-radius: 50% 50% 0 0;
}

.large-smile .right .brow {
  margin-left: -0.125em;
  transform: skewY(-10deg) translateX(-50%) translateZ(0);
}

.large-smile .left .brow {
  margin-left: 0.125em;
  transform: skewY(10deg) translateX(-50%) translateZ(0);
}

.worried .brow {
  width: 1.25em;
  height: 0.875em;
  bottom: 1.25em;
  border-top: none;
  border-bottom: 0.25em solid currentColor;
  border-radius: 0 0 50% 50%;
}

.worried .right .brow {
  margin-left: -0.25em;
  transform: rotate(-20deg) translateX(-50%) translateZ(0);
}

.worried .left .brow {
  margin-left: 0.25em;
  transform: rotate(20deg) translateX(-50%) translateZ(0);
}

.frown .brow {
  width: 1.5em;
  bottom: 1.375em;
  border-top: none;
  border-bottom: 0.25em solid currentColor;
  border-radius: 0 0 50% 50%;
}

.frown .right .brow {
  margin-left: -0.625em;
  transform: rotate(-35deg) translateX(-50%) translateZ(0);
}

.frown .left .brow {
  margin-left: 0.625em;
  transform: rotate(35deg) translateX(-50%) translateZ(0);
}

.surprised .brow {
  bottom: 1em;
  width: 1.5em;
  border-right: none;
  border-left: none;
}

.surprised .right .brow {
  margin-left: -0.5em;
  transform: rotate(-15deg) translateX(-50%) translateZ(0);
}

.surprised .left .brow {
  margin-left: 0.5em;
  transform: rotate(15deg) translateX(-50%) translateZ(0);
}

/* Mouth */

.mouth {
  position: absolute;
  top: 3.125em;
  left: 50%;
  width: 2.5em;
  height: 1.5em;
  transform: translateX(-50%);
  color: #000;
  border: 0.25em solid transparent;
  border-bottom-color: currentColor;
  border-radius: 50%;
}

.mouth::before,
.mouth::after {
  content: '';
  position: absolute;
  left: 50%;
  transform: translateX(-50%);
}

.classic .mouth {
  top: 2.9375em;
}

.large-smile .mouth {
  top: 0.125em;
  width: 3.125em;
  height: 5em;
  border: none;
  border-bottom: 1.5em solid;
  border-radius: 0 0 70% 70%/0 0 50% 50%;
}

.large-smile .mouth::before {
  top: 1.6875em;
  width: 4.25em;
  height: 2em;
  color: #000;
  border: 0.1875em solid transparent;
  border-bottom-color: currentColor;
  border-radius: 0 0 50% 50%;
  box-shadow: 0 0.9375em 0 -0.75em #fff;
}

.large-smile .mouth::after {
  top: 4.4375em;
  width: 1.25em;
  height: 0.375em;
  color: #c00;
  background-color: currentColor;
  border-radius: 70% 70% 70% 70%/50% 50% 100% 100%;
}

.worried .mouth {
  top: 4.5em;
  width: 2em;
  height: 1.25em;
  transform: translateX(-50%) rotate(-10deg) translateZ(0);
  border-top-color: currentColor;
  border-right: none;
  border-bottom-color: transparent;
  border-right-width: 0.5em;
  border-radius: 50% 50% 0 0;
}

.frown .mouth {
  top: 4.25em;
  width: 2.75em;
  height: 2em;
  margin-left: -0.125em;
  transform: translateX(-50%) rotate(-15deg) translateZ(0);
  border-top-color: currentColor;
  border-right: none;
  border-bottom-color: transparent;
  border-right-width: 0.5em;
  border-radius: 50% 50% 0 0;
}

.frown .mouth::before {
  top: 0.375em;
  width: 0.75em;
  height: 0.625em;
  margin-left: 0.125em;
  color: #000;
  border: 0.125em solid transparent;
  border-top-color: currentColor;
  border-right: none;
  border-radius: 50%;
  border-radius: 50% 50% 0 0;
}

.surprised .mouth {
  top: 4em;
  width: 3.125em;
  height: 1.625em;
  background-color: currentColor;
  border: none;
  border-radius: 70% 70% 60% 60%/100% 100% 50% 50%;
}

.surprised .mouth::before,
.surprised .mouth::after {
  color: #fff;
  background-color: currentColor;
}

.surprised .mouth::before {
  top: 0.1875em;
  width: 2em;
  height: 0.375em;
  border-radius: 70% 70% 60% 60%/100% 100% 50% 50%;
}

.surprised .mouth::after {
  bottom: 0.1875em;
  width: 2.25em;
  height: 0.375em;
  border-radius: 70% 70% 60% 60%/100% 100% 50% 50%;
}

/* Upper Body */

.upper-body {
  position: absolute;
  z-index: 1;
  top: 9.25em;
  width: 100%;
  color: hsl(200,0%,90%);
  perspective: 320px;
}

.upper-body::before,
.upper-body::after {
  content: '';
  position: absolute;
  left: 50%;
  transform: translateX(-50%);
}

.upper-body::before {
  bottom: 100%;
  width: 3em;
  height: 3.5em;
  background-color: currentColor;
  background-image:
    linear-gradient(
      to right,
      rgba(255,255,255,0) 50%,
      rgba(255,255,255,0.2),
      rgba(255,255,255,0) 90%
    ),
    linear-gradient(
      rgba(0,0,0,0) 50%,
      rgba(0,0,0,0.05) 80%,
      rgba(0,0,0,0.1)
    );
  border-radius: 50% 50% 0 0/10% 10% 0 0;
}

.upper-body::after {
  top: -2.75em;
  width: 2em;
  height: 2em;
  background-color: rgba(0,0,0,0.9);
  background-image:
    linear-gradient(
      to right,
      rgba(255,255,255,0) 50%,
      rgba(255,255,255,0.2) 80%,
      rgba(255,255,255,0)
    );
  border-radius: 50%/10%;
}

.torso {
  position: absolute;
  z-index: 1;
  top: 0;
  left: 50%;
  width: 7.75em;
  height: 9.125em;
  transform-origin: top center;
  transform: translateX(-50%) rotateX(45deg);
  background-color: currentColor;
  background-image:
    linear-gradient(
      rgba(255,255,255,0.1),
      rgba(0,0,0,0) 80%,
      rgba(0,0,0,0.05) 98%,
      rgba(0,0,0,0.25) 100%
    );
  border-radius: 0.5em 0.5em 0.125em 0.125em;
  box-shadow:
    inset 0 0.25em 0.25em rgba(255,255,255,0.5),
    -1.5em 0.5em 1em -1.25em rgba(0,0,0,0.3),
    1.5em 0.5em 1em -1.25em rgba(0,0,0,0.3);
}

.arm {
  position: absolute;
  left: 50%;
  top: 4em;
  width: 3em;
  height: 5.5em;
  transform-origin: center 1.5em;
  background-color: currentColor;
  border-radius: 1.5em/1em;
}

.arm.right {
  margin-left: -6.25rem;
  transform: translateX(-50%) rotate(12deg);
  box-shadow:
    inset 0.5em 0.25em 0.375em -0.25em rgba(255,255,255,0.4),
    inset 0 0 0.75em 0.75em currentColor,
    inset 0 0 0 2em rgba(255,255,255, 0.15);
}

.arm.left {
  margin-left: 6.25rem;
  transform: translateX(-50%) rotate(-12deg);
  box-shadow:
    inset -0.5em 0.25em 0.375em -0.25em rgba(255,255,255,0.4),
    inset 0 0 0.75em 0.75em currentColor,
    inset 0 0 0 2em rgba(255,255,255, 0.15);
}

.arm::before {
  content: '';
  position: absolute;
  bottom: 3.5em;
  left: 0;
  width: 100%;
  height: 5.5em;
  backface-visibility: hidden;
  transform-origin: center 4.5em;
  background-color: currentColor;
  border-radius: 1.5em/1.5em 1.5em 1em 1em;
}

.arm.right::before {
  transform: rotate(14deg);
  box-shadow:
    inset 0.75em 0.125em 0.375em -0.5em rgba(255,255,255,0.4),
    inset 0.25em 1.1em 0.75em 0.75em currentColor,
    inset 0 0 0 2em rgba(255,255,255, 0.15);
}

.arm.left::before {
  transform: rotate(-14deg);
  box-shadow:
    inset -0.75em 0.125em 0.375em -0.5em rgba(255,255,255,0.4),
    inset -0.25em 1.1em 0.75em 0.75em currentColor,
    inset 0 0 0 2em rgba(255,255,255, 0.15);
}

.arm::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 100%;
  height: 1.5em;
  transform-origin: center 4.5em;
  background-color: currentColor;
  border-radius: 50%;
  box-shadow: inset 0 0 0 1em rgba(255,255,255,0.2);
}

.hand {
  position: absolute;
  z-index: 1;
  top: 80%;
  left: 50%;
  width: 1.75em;
  height: 1.75em;
  transform: translateX(-50%);
  color: hsla(50,90%,50%,1);
  background-color: currentColor;
  background-image:
    linear-gradient(
      to right,
      rgba(255,255,255,0.2),
      rgba(0,0,0,0.075),
      rgba(255,255,255,0.2)
    );
  border-radius: 1em/0.5em;
  box-shadow: 0 -0.125em 0.125em rgba(0,0,0,0.1);
}

.hand::before {
  content: '';
  position: absolute;
  z-index: 1;
  top: 1em;
  left: 50%;
  width: 3.5em;
  height: 3.5em;
  transform: translateX(-50%);
  color: hsla(50,90%,60%,1);
  border: 0.75em solid;
  border-bottom-color: transparent;
  box-shadow:
    inset 0 0.25em rgba(0,0,0,0.15),
    inset 0 0.25em;
  border-radius: 50%;
}

/* Lower Body */

.lower-body {
  position: absolute;
  top: 18.5em;
  left: 50%;
  width: 10em;
  height: 11.75em;
  transform: translateX(-50%);
  color: hsl(200,0%,90%);
  transition: transform 400ms;
}

.explode .lower-body {
  transform: translate(-50%, 8em);
}

.lower-body > div {
  position: absolute;
  background-color: currentColor;
}

.waist {
  z-index: 1;
  top: 0;
  width: 100%;
  height: 1.5em;
  background-image:
    linear-gradient(
      rgba(0,0,0,0.15),
      rgba(0,0,0,0) 80%,
      rgba(255,255,255,0.1) 90%,
      rgba(255,255,255,0.15)
    );
  border-radius: 0.125em;
  box-shadow: 0 0.75em 0.75em -0.25em rgba(0,0,0,0.25);
}

.waist::before,
.waist::after {
  content: '';
  position: absolute;
  bottom: 100%;
  left: 50%;
  width: 3em;
  height: 3em;
  transform: translateX(-50%);
  background-color: currentColor;
  background-image:
    linear-gradient(
      rgba(255,255,255,0.75),
      rgba(255,255,255,0) 10%
    ),
    linear-gradient(
      to right,
      rgba(255,255,255,0) 20%,
      rgba(255,255,255,0.25) 25%,
      rgba(255,255,255,0) 40%,
      rgba(255,255,255,0) 60%,
      rgba(255,255,255,0.25) 75%,
      rgba(255,255,255,0) 80%,
      rgba(255,255,255,0.2)
    ),
    linear-gradient(
      rgba(255,255,255,0.1),
      rgba(0,0,0,0.15)
    );
}

.waist::before {
  margin-left: -2.75em;
  border-radius: 50% 30% 0 0/100% 30% 0 100%;
}

.waist::after {
  margin-left: 2.75em;
  border-radius: 30% 50% 0% 0%/30% 100% 100% 0%;
}

.crotch {
  z-index: 1;
  top: 1.5em;
  left: 50%;
  width: 10%;
  height: 4.5em;
  transform: translateX(-50%);
  background-image:
    linear-gradient(
      rgba(0,0,0,0.2),
      rgba(0,0,0,0.05) 10%,
      rgba(0,0,0,0.2) 10%,
      rgba(255,255,255,0.1),
      rgba(0,0,0,0.1)
    );
  border-radius: 0 0 0.25em 0.25em;
  box-shadow:
    -0.5em 0 0.25em -0.25em rgba(0,0,0,0.15),
    0.5em 0 0.25em -0.25em rgba(0,0,0,0.15),
    -0.25em 0 0.125em -0.125em rgba(0,0,0,0.2),
    0.25em 0 0.125em -0.125em rgba(0,0,0,0.2);
}

.leg {
  bottom: 0;
  left: 50%;
  width: 4.75em;
  height: 10.75em;
  transform: translateX(-50%);
  background-image:
    linear-gradient(
      rgba(0,0,0,0.1) 10%,
      rgba(255,255,255,0.1) 25%,
      rgba(0,0,0,0.1) 45%,
      rgba(0,0,0,0), 50%,
      rgba(0,0,0,0.05), 65%,
      rgba(0,0,0,0) 74%,
      rgba(0,0,0,0.1), 78%,
      rgba(255,255,255,0.2) 78%,
      rgba(255,255,255,0) 82%,
      rgba(0,0,0,0.1)
    );
  border-radius: 0.25em 0.25em 0.0625em 0.0625em;
}

.leg.right {
  margin-left: -2.75em;
}

.leg.left {
  margin-left: 2.75em;
}


/* Controls */

.controls {
  position: relative;
  z-index: 1;
  width: 200px;
  padding: 1.5em;
  color: #333;
  text-transform: uppercase;
  background-color: rgba(220,220,220,0.5);
}

.controls .title {
  margin-bottom: 0.5rem;
  font-weight: 900;
  font-size: 1.25em;
  letter-spacing: 0.03125em;
}

.button {
  width: 100%;
  padding: 0.5em 1em;
  margin: 0.25rem 0;
  color: #666;
  font-family: inherit;
  text-transform: uppercase;
  letter-spacing: 0.0625em;
  background-color: #fff;
  border: 1px solid #ddd;
  border-radius: 0.5em;
  cursor: pointer;
  outline: none;
}

.button:hover {
  color: #000;
  border-color: #ccc;
}

.button:active {
  background-color: #ddd;
}

.controls fieldset {
  border: none;
  margin: 1rem 0;
}

.controls legend {
  margin-bottom: 1rem;
  font-weight: bold;
  font-size: small;
  letter-spacing: 0.03125em;
}

.controls label {
  display: block;
  font-size: x-small;
  letter-spacing: 0.0625em;
}

.controls input[type="range"] {
  -webkit-appearance: none; 
  appearance: none;
  position: relative;
  width: 100%;
  height: 2em;
  padding: 0.375em;
  margin: 0.25rem 0 1rem;
  color: inherit;
  background-color: currentColor;
  border-radius: 1em;
  outline: none;
}

.controls input[type="range"]::-webkit-slider-thumb {
  -webkit-appearance: none; 
  appearance: none;
  position: relative;
  z-index: 10;
  width: 1.5em;
  height: 1.5em;
  background-color: hsla(50,90%,50%,1);
  border-radius: 50%;
  cursor: pointer;
}

.controls input[type="range"]::-moz-range-thumb {
  position: relative;
  z-index: 10;
  width: 1.5em;
  height: 1.5em;
  background-color: #333;
  border-radius: 50%;
  cursor: pointer;
}

.controls input[type="range"]::-moz-range-track {
  background-color: transparent;
}
!

JS 

              
                var minifigure = document.querySelector('.minifigure');
var faces = document.querySelector('.faces');
var upperBody = document.querySelector('.upper-body');
var lowerBody = document.querySelector('.lower-body');
var explode = document.querySelector('.explode');
var randomize = document.querySelector('.randomize');
var expressionRangeInput = document.querySelector('.expression-range');
var colorRangeInput = document.querySelectorAll('.color-range');
var upperHue = document.getElementById('upper-hue');
var upperSaturation = document.getElementById('upper-saturation');
var upperLightness = document.getElementById('upper-lightness');
var lowerHue = document.getElementById('lower-hue');
var lowerSaturation = document.getElementById('lower-saturation');
var lowerLightness = document.getElementById('lower-lightness');

explode.addEventListener('click', explodeMinifigure);
randomize.addEventListener('click', randomizeInputs);
expressionRangeInput.addEventListener('input', setExpression);

for (var i = 0; i < colorRangeInput.length; i++) {
  colorRangeInput[i].addEventListener('input', setColors);
}

function getRandomNum(min, max) {
  return Math.random() * (max - min) + min;
}

function explodeMinifigure() {
  minifigure.classList.toggle('explode');
  
  if (minifigure.classList.contains('explode')) {
    explode.innerHTML = 'Rebuild';
  } else {
    explode.innerHTML = 'Explode';
  }
};

function randomizeInputs() {
  var randomExpression = getRandomNum(0, 5);
  var randomUpperHue = getRandomNum(0, 360);
  var randomUpperSaturation = getRandomNum(0, 100);
  var randomUpperLightness = getRandomNum(0, 90);
  var randomLowerHue = getRandomNum(0, 360);
  var randomLowerSaturation = getRandomNum(0, 100);
  var randomLowerLightness = getRandomNum(0, 90);
  
  expressionRangeInput.value = randomExpression * 100;
  upperHue.value = randomUpperHue;
  upperSaturation.value = randomUpperSaturation;
  upperLightness.value = randomUpperLightness;
  lowerHue.value = randomLowerHue;
  lowerSaturation.value = randomLowerSaturation;
  lowerLightness.value = randomLowerLightness;
  
  setExpression();
  setColors();
};

function setExpression() {
  var expressionVal = parseInt(expressionRangeInput.value);
  faces.style.transform = 'translateX(-' + expressionVal + '%)';
};

function setColors() {
  var upperHueVal = parseInt(upperHue.value);
  var upperSaturationVal = parseInt(upperSaturation.value);
  var upperLightnessVal = parseInt(upperLightness.value);
  var lowerHueVal = parseInt(lowerHue.value);
  var lowerSaturationVal = parseInt(lowerSaturation.value);
  var lowerLightnessVal = parseInt(lowerLightness.value);
  
  upperBody.style.color = 'hsl(' + upperHueVal + ',' + upperSaturationVal + '%,' + upperLightnessVal + '%)';
  lowerBody.style.color = 'hsl(' + lowerHueVal + ',' + lowerSaturationVal + '%,' + lowerLightnessVal + '%)';
};
!
999px

Console