CodePen Embed - Responsive Flexbox Grid (with TwicPics LQIP)

<!-- LQIP example with TwicPics (http://www.twicpics.com) -->
<main>
  <figure style="background-image: url(https://demo.twic.pics/codepen/tp-artichoke.jpg?twic=v1/output=preview)">
    <img data-twic-src="image:codepen/tp-artichoke.jpg" alt="Artichoke">
    <figcaption>Artichoke</figcaption>
  </figure>
  <figure style="background-image: url(https://demo.twic.pics/codepen/tp-canyon.jpg?twic=v1/output=preview)">
    <img data-twic-src="image:codepen/tp-canyon.jpg" alt="Canyon">
    <figcaption>Canyon</figcaption>
  </figure>
  <figure style="background-image: url(https://demo.twic.pics/codepen/tp-friend.jpg?twic=v1/output=preview)">
    <img data-twic-src="image:codepen/tp-friend.jpg" alt="Friend">
    <figcaption>Friend</figcaption>
  </figure>
  <figure style="background-image: url(https://demo.twic.pics/codepen/tp-cereals.jpg?twic=v1/output=preview)">
    <img data-twic-src="image:codepen/tp-cereals.jpg" alt="Cereals">
    <figcaption>Ceretwicals</figcaption>
  </figure>
  <figure style="background-image: url(https://demo.twic.pics/codepen/tp-lion.jpg?twic=v1/output=preview)">
    <img data-twic-src="image:codepen/tp-lion.jpg" alt="Lion">
    <figcaption>Lion</figcaption>
  </figure>
  <figure style="background-image: url(https://demo.twic.pics/codepen/tp-doggy.jpg?twic=v1/output=preview)">
    <img data-twic-src="image:codepen/tp-doggy.jpg" alt="Doggy">
    <figcaption>Doggy</figcaption>
  </figure>
  <figure style="background-image: url(https://demo.twic.pics/codepen/tp-cafe.jpg?twic=v1/output=preview)">
    <img data-twic-src="image:codepen/tp-cafe.jpg" alt="Cafe">
    <figcaption>Cafe</figcaption>
  </figure>
  <figure style="background-image: url(https://demo.twic.pics/codepen/tp-castle.jpg?twic=v1/output=preview)">
    <img data-twic-src="image:codepen/tp-castle.jpg" alt="Castle">
    <figcaption>Castle</figcaption>
  </figure>
  <figure style="background-image: url(https://demo.twic.pics/codepen/tp-lake.jpg?twic=v1/output=preview)">
    <img data-twic-src="image:codepen/tp-lake.jpg" alt="Lake">
    <figcaption>Lake</figcaption>
  </figure>
  <figure style="background-image: url(https://demo.twic.pics/codepen/tp-rasp.jpg?twic=v1/output=preview)">
    <img data-twic-src="image:codepen/tp-rasp.jpg" alt="Rasp">
    <figcaption>Rasp</figcaption>
  </figure>
  <figure style="background-image: url(https://demo.twic.pics/codepen/tp-moth.jpg?twic=v1/output=preview)">
    <img data-twic-src="image:codepen/tp-moth.jpg" alt="Moth">
    <figcaption>Moth</figcaption>
  </figure>
  <figure style="background-image: url(https://demo.twic.pics/codepen/tp-pug.jpg?twic=v1/output=preview)">
    <img data-twic-src="image:codepen/tp-pug.jpg" alt="Pug">
    <figcaption>Pug</figcaption>
  </figure>
  <figure style="background-image: url(https://demo.twic.pics/codepen/tp-artichoke.jpg?twic=v1/output=preview)">
    <img data-twic-src="image:codepen/tp-artichoke.jpg" alt="Artichoke">
    <figcaption>Artichoke</figcaption>
  </figure>
  <figure style="background-image: url(https://demo.twic.pics/codepen/tp-canyon.jpg?twic=v1/output=preview)">
    <img data-twic-src="image:codepen/tp-canyon.jpg" alt="Canyon">
    <figcaption>Canyon</figcaption>
  </figure>
  <figure style="background-image: url(https://demo.twic.pics/codepen/tp-friend.jpg?twic=v1/output=preview)">
    <img data-twic-src="image:codepen/tp-friend.jpg" alt="Friend">
    <figcaption>Friend</figcaption>
  </figure>
  <figure style="background-image: url(https://demo.twic.pics/codepen/tp-cereals.jpg?twic=v1/output=preview)">
    <img data-twic-src="image:codepen/tp-cereals.jpg" alt="Cereals">
    <figcaption>Ceretwicals</figcaption>
  </figure>
  <figure style="background-image: url(https://demo.twic.pics/codepen/tp-lion.jpg?twic=v1/output=preview)">
    <img data-twic-src="image:codepen/tp-lion.jpg" alt="Lion">
    <figcaption>Lion</figcaption>
  </figure>
  <figure style="background-image: url(https://demo.twic.pics/codepen/tp-doggy.jpg?twic=v1/output=preview)">
    <img data-twic-src="image:codepen/tp-doggy.jpg" alt="Doggy">
    <figcaption>Doggy</figcaption>
  </figure>
  <figure style="background-image: url(https://demo.twic.pics/codepen/tp-cafe.jpg?twic=v1/output=preview)">
    <img data-twic-src="image:codepen/tp-cafe.jpg" alt="Cafe">
    <figcaption>Cafe</figcaption>
  </figure>
  <figure style="background-image: url(https://demo.twic.pics/codepen/tp-castle.jpg?twic=v1/output=preview)">
    <img data-twic-src="image:codepen/tp-castle.jpg" alt="Castle">
    <figcaption>Castle</figcaption>
  </figure>
  <figure style="background-image: url(https://demo.twic.pics/codepen/tp-lake.jpg?twic=v1/output=preview)">
    <img data-twic-src="image:codepen/tp-lake.jpg" alt="Lake">
    <figcaption>Lake</figcaption>
  </figure>
  <figure style="background-image: url(https://demo.twic.pics/codepen/tp-rasp.jpg?twic=v1/output=preview)">
    <img data-twic-src="image:codepen/tp-rasp.jpg" alt="Rasp">
    <figcaption>Rasp</figcaption>
  </figure>
  <figure style="background-image: url(https://demo.twic.pics/codepen/tp-moth.jpg?twic=v1/output=preview)">
    <img data-twic-src="image:codepen/tp-moth.jpg" alt="Moth">
    <figcaption>Moth</figcaption>
  </figure>
  <figure style="background-image: url(https://demo.twic.pics/codepen/tp-pug.jpg?twic=v1/output=preview)">
    <img data-twic-src="image:codepen/tp-pug.jpg" alt="Pug">
    <figcaption>Pug</figcaption>
  </figure>
  <figure style="background-image: url(https://demo.twic.pics/codepen/tp-artichoke.jpg?twic=v1/output=preview)">
    <img data-twic-src="image:codepen/tp-artichoke.jpg" alt="Artichoke">
    <figcaption>Artichoke</figcaption>
  </figure>
  <figure style="background-image: url(https://demo.twic.pics/codepen/tp-canyon.jpg?twic=v1/output=preview)">
    <img data-twic-src="image:codepen/tp-canyon.jpg" alt="Canyon">
    <figcaption>Canyon</figcaption>
  </figure>
  <figure style="background-image: url(https://demo.twic.pics/codepen/tp-friend.jpg?twic=v1/output=preview)">
    <img data-twic-src="image:codepen/tp-friend.jpg" alt="Friend">
    <figcaption>Friend</figcaption>
  </figure>
  <figure style="background-image: url(https://demo.twic.pics/codepen/tp-cereals.jpg?twic=v1/output=preview)">
    <img data-twic-src="image:codepen/tp-cereals.jpg" alt="Cereals">
    <figcaption>Ceretwicals</figcaption>
  </figure>
  <figure style="background-image: url(https://demo.twic.pics/codepen/tp-lion.jpg?twic=v1/output=preview)">
    <img data-twic-src="image:codepen/tp-lion.jpg" alt="Lion">
    <figcaption>Lion</figcaption>
  </figure>
  <figure style="background-image: url(https://demo.twic.pics/codepen/tp-doggy.jpg?twic=v1/output=preview)">
    <img data-twic-src="image:codepen/tp-doggy.jpg" alt="Doggy">
    <figcaption>Doggy</figcaption>
  </figure>
  <figure style="background-image: url(https://demo.twic.pics/codepen/tp-cafe.jpg?twic=v1/output=preview)">
    <img data-twic-src="image:codepen/tp-cafe.jpg" alt="Cafe">
    <figcaption>Cafe</figcaption>
  </figure>
  <figure style="background-image: url(https://demo.twic.pics/codepen/tp-castle.jpg?twic=v1/output=preview)">
    <img data-twic-src="image:codepen/tp-castle.jpg" alt="Castle">
    <figcaption>Castle</figcaption>
  </figure>
  <figure style="background-image: url(https://demo.twic.pics/codepen/tp-lake.jpg?twic=v1/output=preview)">
    <img data-twic-src="image:codepen/tp-lake.jpg" alt="Lake">
    <figcaption>Lake</figcaption>
  </figure>
  <figure style="background-image: url(https://demo.twic.pics/codepen/tp-rasp.jpg?twic=v1/output=preview)">
    <img data-twic-src="image:codepen/tp-rasp.jpg" alt="Rasp">
    <figcaption>Rasp</figcaption>
  </figure>
  <figure style="background-image: url(https://demo.twic.pics/codepen/tp-moth.jpg?twic=v1/output=preview)">
    <img data-twic-src="image:codepen/tp-moth.jpg" alt="Moth">
    <figcaption>Moth</figcaption>
  </figure>
  <figure style="background-image: url(https://demo.twic.pics/codepen/tp-pug.jpg?twic=v1/output=preview)">
    <img data-twic-src="image:codepen/tp-pug.jpg" alt="Pug">
    <figcaption>Pug</figcaption>
  </figure>
  <figure style="background-image: url(https://demo.twic.pics/codepen/tp-artichoke.jpg?twic=v1/output=preview)">
    <img data-twic-src="image:codepen/tp-artichoke.jpg" alt="Artichoke">
    <figcaption>Artichoke</figcaption>
  </figure>
  <figure style="background-image: url(https://demo.twic.pics/codepen/tp-canyon.jpg?twic=v1/output=preview)">
    <img data-twic-src="image:codepen/tp-canyon.jpg" alt="Canyon">
    <figcaption>Canyon</figcaption>
  </figure>
  <figure style="background-image: url(https://demo.twic.pics/codepen/tp-friend.jpg?twic=v1/output=preview)">
    <img data-twic-src="image:codepen/tp-friend.jpg" alt="Friend">
    <figcaption>Friend</figcaption>
  </figure>
  <figure style="background-image: url(https://demo.twic.pics/codepen/tp-cereals.jpg?twic=v1/output=preview)">
    <img data-twic-src="image:codepen/tp-cereals.jpg" alt="Cereals">
    <figcaption>Ceretwicals</figcaption>
  </figure>
  <figure style="background-image: url(https://demo.twic.pics/codepen/tp-lion.jpg?twic=v1/output=preview)">
    <img data-twic-src="image:codepen/tp-lion.jpg" alt="Lion">
    <figcaption>Lion</figcaption>
  </figure>
  <figure style="background-image: url(https://demo.twic.pics/codepen/tp-doggy.jpg?twic=v1/output=preview)">
    <img data-twic-src="image:codepen/tp-doggy.jpg" alt="Doggy">
    <figcaption>Doggy</figcaption>
  </figure>
  <figure style="background-image: url(https://demo.twic.pics/codepen/tp-cafe.jpg?twic=v1/output=preview)">
    <img data-twic-src="image:codepen/tp-cafe.jpg" alt="Cafe">
    <figcaption>Cafe</figcaption>
  </figure>
  <figure style="background-image: url(https://demo.twic.pics/codepen/tp-castle.jpg?twic=v1/output=preview)">
    <img data-twic-src="image:codepen/tp-castle.jpg" alt="Castle">
    <figcaption>Castle</figcaption>
  </figure>
  <figure style="background-image: url(https://demo.twic.pics/codepen/tp-lake.jpg?twic=v1/output=preview)">
    <img data-twic-src="image:codepen/tp-lake.jpg" alt="Lake">
    <figcaption>Lake</figcaption>
  </figure>
  <figure style="background-image: url(https://demo.twic.pics/codepen/tp-rasp.jpg?twic=v1/output=preview)">
    <img data-twic-src="image:codepen/tp-rasp.jpg" alt="Rasp">
    <figcaption>Rasp</figcaption>
  </figure>
  <figure style="background-image: url(https://demo.twic.pics/codepen/tp-moth.jpg?twic=v1/output=preview)">
    <img data-twic-src="image:codepen/tp-moth.jpg" alt="Moth">
    <figcaption>Moth</figcaption>
  </figure>
  <figure style="background-image: url(https://demo.twic.pics/codepen/tp-pug.jpg?twic=v1/output=preview)">
    <img data-twic-src="image:codepen/tp-pug.jpg" alt="Pug">
    <figcaption>Pug</figcaption>
  </figure>
  <figure style="background-image: url(https://demo.twic.pics/codepen/tp-artichoke.jpg?twic=v1/output=preview)">
    <img data-twic-src="image:codepen/tp-artichoke.jpg" alt="Artichoke">
    <figcaption>Artichoke</figcaption>
  </figure>
  <figure style="background-image: url(https://demo.twic.pics/codepen/tp-canyon.jpg?twic=v1/output=preview)">
    <img data-twic-src="image:codepen/tp-canyon.jpg" alt="Canyon">
    <figcaption>Canyon</figcaption>
  </figure>
  <figure style="background-image: url(https://demo.twic.pics/codepen/tp-friend.jpg?twic=v1/output=preview)">
    <img data-twic-src="image:codepen/tp-friend.jpg" alt="Friend">
    <figcaption>Friend</figcaption>
  </figure>
  <figure style="background-image: url(https://demo.twic.pics/codepen/tp-cereals.jpg?twic=v1/output=preview)">
    <img data-twic-src="image:codepen/tp-cereals.jpg" alt="Cereals">
    <figcaption>Ceretwicals</figcaption>
  </figure>
  <figure style="background-image: url(https://demo.twic.pics/codepen/tp-lion.jpg?twic=v1/output=preview)">
    <img data-twic-src="image:codepen/tp-lion.jpg" alt="Lion">
    <figcaption>Lion</figcaption>
  </figure>
  <figure style="background-image: url(https://demo.twic.pics/codepen/tp-doggy.jpg?twic=v1/output=preview)">
    <img data-twic-src="image:codepen/tp-doggy.jpg" alt="Doggy">
    <figcaption>Doggy</figcaption>
  </figure>
  <figure style="background-image: url(https://demo.twic.pics/codepen/tp-cafe.jpg?twic=v1/output=preview)">
    <img data-twic-src="image:codepen/tp-cafe.jpg" alt="Cafe">
    <figcaption>Cafe</figcaption>
  </figure>
  <figure style="background-image: url(https://demo.twic.pics/codepen/tp-castle.jpg?twic=v1/output=preview)">
    <img data-twic-src="image:codepen/tp-castle.jpg" alt="Castle">
    <figcaption>Castle</figcaption>
  </figure>
  <figure style="background-image: url(https://demo.twic.pics/codepen/tp-lake.jpg?twic=v1/output=preview)">
    <img data-twic-src="image:codepen/tp-lake.jpg" alt="Lake">
    <figcaption>Lake</figcaption>
  </figure>
  <figure style="background-image: url(https://demo.twic.pics/codepen/tp-rasp.jpg?twic=v1/output=preview)">
    <img data-twic-src="image:codepen/tp-rasp.jpg" alt="Rasp">
    <figcaption>Rasp</figcaption>
  </figure>
  <figure style="background-image: url(https://demo.twic.pics/codepen/tp-moth.jpg?twic=v1/output=preview)">
    <img data-twic-src="image:codepen/tp-moth.jpg" alt="Moth">
    <figcaption>Moth</figcaption>
  </figure>
  <figure style="background-image: url(https://demo.twic.pics/codepen/tp-pug.jpg?twic=v1/output=preview)">
    <img data-twic-src="image:codepen/tp-pug.jpg" alt="Pug">
    <figcaption>Pug</figcaption>
  </figure>
</main>

$breakpoint-from-tablet: "only screen and (min-width: 768px)";
$breakpoint-from-desktop-sml:  "only screen and (min-width: 769px)";
$breakpoint-from-desktop-mid: "only screen and (min-width: 1200px)";
$breakpoint-from-desktop-lrg: "only screen and (min-width: 1600px)";

@mixin aspect-ratio($width, $height) {
  position: relative;
  overflow: hidden;

  &:before {
    display: block;
    content: "";
    width: 100%;
    padding-top: ($height / $width) * 100%;
  }

  > img {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
  }
}

html {
  box-sizing: border-box;
}

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

main {
  padding: 10px;

  @media #{ $breakpoint-from-tablet } {
    display: flex;
    justify-content: space-around;
    flex-direction: row;
    flex-wrap: wrap;
  }
}

figure {
  @include aspect-ratio(16, 9);
  background-color: white;
  background-position: center;
  background-size: cover;
  background-repeat: no-repeat;
  border: 10px solid white;
  margin: auto;
  width: 100%;

  @media #{ $breakpoint-from-tablet } {
    @include aspect-ratio(1, 1);
    flex: 0 1 auto;
    width: 50%;
  }

  @media #{ $breakpoint-from-desktop-sml } {
    width: 33%;
  }

  @media #{ $breakpoint-from-desktop-mid } {
    @include aspect-ratio(4, 3);
    width: 33%;
  }

  @media #{ $breakpoint-from-desktop-lrg } {
    @include aspect-ratio(4, 3);
    width: 25%;
  }

  img {
    display: block;
    object-fit: cover;
    width: 100%;
    height: 100%;
    opacity: 0;
    transform: scale(1);
    will-change: opacity, transform;
    transition: opacity 1s linear, transform .75s ease-out;

    &.twic-done {
      opacity: 1;
    }
    
    &:hover {
      transform: scale(1.1);
    }
  }

  figcaption {
    position: absolute;
    bottom: 0;
    width: 100%;
    background-color: rgba(black, 0.5);
    padding: 8px 10px;
    font-size: 12px;
    color: white;
    text-transform: uppercase;
  }
}

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