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Adding Classes

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About the <head>

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CSS

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CSS Base

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HTML 

              
                <div class="container" data-wrap>
</div>

<menu aria-label="controls">
  <li>
    <button data-toggleslant aria-label="toggle slant"></button>
  </li>
  <li>
    <button data-togglelight aria-label="toggle lightmode"></button>
  </li>
</menu>

<!-- logo for <use /> in cards -->
<div class="logo">
  <svg xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink">
    <defs>
      <symbol id="logo" viewBox="0 0 180 180">
          <defs><path id="crest-feather" d="M70 70H20a30 30 0 0 0 30 30h20a10 10 0 0 1 9.22 6.13A40 40 0 0 1 110 110a40 40 0 0 0-40-40z"></path></defs> 
          <path fill="#19F" d="M70 140a40 40 0 0 1 80 0z" class="top-beak"></path> <use xlink:href="#crest-feather" fill="#ED0" class="crest crest__gold"></use> <use xlink:href="#crest-feather" fill="#6C6" transform="rotate(30 110 110)" class="crest crest__green"></use> <use xlink:href="#crest-feather" fill="#19F" transform="rotate(60 110 110)" class="crest crest__blue"></use> <use xlink:href="#crest-feather" fill="#F69" transform="rotate(90 110 110)" class="crest crest__pink"></use> <path fill="#F69" d="M30 170h80v-60a39.8 39.8 0 0 0-5.25-19.81A80 80 0 0 0 30 170z" class="head"></path> <circle fill="#FFF" cx="87.5" cy="127.25" r="7.5" class="eye"></circle> <path fill="#ED0" d="M120 140a10 10 0 0 1-10-10v40a30 30 0 0 0 30-30z" class="top-beak"></path>
        </svg>
      </symbol>
    </defs>
  </div>
!

CSS 

              
                :root {
  --bgc: #202124;
  --fgc: #fff;
  --t: 20s;
  --r: 12deg;
  
  font-family: Inter, sans-serif;
  
  background: var(--bgc);
  color: var(--fgc);
}

.light {
  --fgc: #000;
  --bgc: #fff;
}

.slantback {
  --r: -12deg;
}
/*
svg {
  overflow: visible;
}
svg path {
  stroke: var(--bgc);
  stroke-width: 8px;
}*/

.container {
  position: absolute;
  top: 50%;
  left: 50%;
  width: 100%;
  height: 80vmin;
  background: var(--bgc);
  transform: translate(-50%, -50%);
  overflow: hidden;
  
  &::after,
  &::before {
    content: '';
    position: absolute;
    transition: transform 500ms cubic-bezier(.3,.7,0,1);
  }
  
  &::after {
    z-index: 2;
    top: -20vmin;
    right: -10%;
    bottom: -20vmin;
    width: 60%;
    background: var(--bgc);
    box-shadow: 0 0 5rem var(--bgc);
    transform: rotate(var(--r));
    transform-origin: 0 50%;
  }
  
  &::before {
    z-index: 5;
    top: 50%;
    height: 75vmin;
    left: 50%;
    width: 3px;
    background: var(--fgc);
    border-radius: 2px;
    transform: translate(-50%, -50%) rotate(var(--r));
  }
}

.color {
  text-decoration: none;
  z-index: 1;
  width: 30vmin;
  --bg: var(--fgc);
  background: var(--bg);
  
  color: var(--bgc);
  display: flex;
  flex-direction: column;
  
  padding: 0.5vmin 1vmin 1.25vmin;
  //border-radius: 4px;
  border: 1px solid var(--fgc);
  
  perspective: 600px;
  
  // animation
  position: absolute;
  top: 50%;
  right: 0;
  transform: translateY(-50%) translateX(100%);
  
  animation: var(--t) gotToLeft cubic-bezier(0, 1, 0.6, 1);
  animation-fill-mode: forwards;
  animation-count: 1;
  
  // glow
  &::before {
    opacity: .5;
    position: absolute;
    content: '';
    inset: 0;
    //background: var(--color);
    box-shadow: 0 0 3rem var(--color);
    
    //filter: blur(3rem);
    animation: var(--t) fadeOut cubic-bezier(0, 1, 0.6, 1);
  }
  
  &::after {
    content: '';
    position: absolute;
    inset: 0;
    
    background: var(--color);
    background: var(--bgc);
    
    transform: scale(1);
    animation: var(--t) fade cubic-bezier(0, 1, 0.6, 1);
  } 
}

@keyframes fadeOut {
  0%, 17% {
    opacity: .5;
  }
  20%, 100% {
    opacity: 0;
    transform: scale(1);
  }
}

.color--top {
  // top clone of the card 
  // (for the right part of the animation)
  background: transparent;
  color: transparent;
  z-index: 4;
  border-color: transparent;
  
  --bg: transparent;
  box-shadow: none;
  pointer-events: none;
  
  &::before {
    display: none;
  }
  &::after {
    display: none;
  } 
}

@keyframes fade {
  0%, 17% {
    opacity: 0;
  }
  33%, 100% {
    opacity: 1;
    transform: scale(1.05);
  }
}

@keyframes gotToLeft {
  90%, 100% {
    right: 100%;
    transform: translateY(-50%) translateX(-3rem) scale(.75);
    //transform: translateY(-50%) translateX(50%) translateZ(50vmin) rotateY(-100deg);
  }
}


.color__bottom,
.color__top {
  background: var(--bg);
  padding: 0.3em;
}

.color__bottom {
  padding-bottom: 0.2em;
} 

.color__top {
  order: 1;
  display: flex;
  justify-content: space-between;
}

.color__brand {
  font-weight: 300;
  font-size: 2.1vmin;
}

.color__logo {
  height: 2.2vmin;
  width: 2.2vmin;
  transform: scale(1.1) translateY(-10%);
}

.color--top .color__logo {
  opacity: 0;
}

.color__bottom {
  order: 3;
}
.color__swatch {
  order: 2;
  aspect-ratio: 1;
  background: var(--color);
  //animation: var(--t) top cubic-bezier(0, 1, 0.6, 1);
}

@keyframes top {
  0%, 5% {
    transform: scale(1.2);
  }
  15%, 100% {
    transform: scale(1);
  }
}

.color--top .color__swatch {
  animation: var(--t) op cubic-bezier(0, 1, 0.6, 1);
  //box-shadow: 0 0 3em var(--color);
}

@keyframes op {
  /*0% {
    transform: translateX(15%) scaleY(2) scaleX(1.5) rotateY(-55deg);
  }
  5% {
    transform: translateX(15%) scaleY(1.05) scaleX(1.2) rotateY(-45deg);
  }*/
  0% {
    transform: translateX(50%) translateZ(50vmin) rotateY(-100deg);
  }
  11% {
    opacity: 1;
    transform: scale(0.955);
  }
  13%, 100% {
    opacity: 0;
    transform: scale(1);
  }
}

.color__name,
.color__value {
  display: block;
  height: 1.2em;
  line-height: 1.2;
  overflow: hidden;
  white-space: nowrap;
  text-overflow: ellipsis;
  animation: var(--t) swipe cubic-bezier(0, 1, 0.6, 1);
}

@keyframes swipe {
  0%, 5% {
    opacity: 0;
    transform: scale(1.1) translateX(25%);
  }
  12.5%, 100% {
    opacity: 1;
    transform: scale(1);
  }
}

.color__value {
  font-weight: 700;
  font-size: 3.5vmin;
  animation-delay: 75ms;
}

.color__name {
  margin-top: -0.2em;
  font-size: 2.1vmin;
  font-weight: 300;
}

.slantback {
  .color__value {
    animation-delay: 0ms;
  }
  .color__name {
    animation-delay: 75ms;
  }
}

.logo {
  display: none;
}

menu {
  display: flex;
  position: absolute;
  bottom: 0;
  right: 0;
}

button {
  padding: 2.5vmin;
  font-size: 3vmin;
  line-height: 1;
  background: transparent;
  border: none;
  color: var(--fgc);
  
  &::after {
    content: '☼';
  }
  &[aria-pressed]::after {
    content: '🌑'
  }
  &[data-toggleslant] {
    margin-right: -2vmin;
    &::after {
      content: "\\";
    }
    &[aria-pressed]::after {
      content: '/'
    }
  }
}

menu, li {
  list-style: none;
}
!

JS 

              
                let allTheColors = [];
let animationDuration = 1400; //ms

const createCard = (
  color = '#0022ff', 
  name = 'Toxic Blue'
) => {
  const $wrap = document.createElement('a');
  $wrap.setAttribute('href', `https://parrot.color.pizza/color/${color.substring(1)}/%E2%9D%A4`);
  $wrap.setAttribute('target', '_blank');
  
  const $head = document.createElement('header');
  const $color =  document.createElement('div');
  const $upperPart = document.createElement('div');
  
  const $colorName = document.createElement('h2');
  const $colorValue = document.createElement('var');
  
  $colorName.classList.add('color__name');
  $colorValue.classList.add('color__value');
  $colorValue.textContent = color;
  $colorName.textContent = name;
  
  const logo = `<strong class="color__brand">Color Parrot</strong><svg class="color__logo" viewBox="0 0 180 180"><use href="#logo" /></svg>`;
  // too lazy to google the namespaced createElement :(
  $upperPart.innerHTML = logo;
  
  $wrap.classList.add('color');
  $head.classList.add('color__bottom');
  $upperPart.classList.add('color__top');
  $color.classList.add('color__swatch');
  
  $head.appendChild($colorValue);
  $head.appendChild($colorName);
  
  [$head, $color, $upperPart].forEach($el => $wrap.appendChild($el));
  
  $wrap.style.setProperty('--color', color);
  
  return $wrap;
}

const $wrap = document.querySelector('[data-wrap]');

const addRandomCard = colorList => {
  const l = colorList.length;
  const index = Math.floor(Math.random() * colorList.length);
  const {name, hex} = colorList[index];
  const $card = createCard(hex, name);
  const $cardTop = $card.cloneNode(true); 
  
  $cardTop.classList.add('color--top');
  
  $wrap.appendChild(
    $card
  );
  $wrap.appendChild(
    $cardTop
  );
  
  setTimeout(() => {
    $card.remove();
    $cardTop.remove();
  }, 20100);
}

fetch('https://api.color.pizza/v1/?goodnamesonly=true')
  .then(d => d.json())
  .then(data => {
    allTheColors = data;
    setInterval(() => 
      addRandomCard(data.colors),           
      animationDuration
    );
});

const $btn = document.querySelector('[data-togglelight]');

$btn.addEventListener('click', () => {
  document.documentElement.classList.toggle('light');
  $btn.toggleAttribute('aria-pressed');
});

const $btnSlnt = document.querySelector('[data-toggleslant]');

$btnSlnt.addEventListener('click', () => {
  document.documentElement.classList.toggle('slantback');
  $btnSlnt.toggleAttribute('aria-pressed');
});
!
999px

Console