<footer>
  <div class="control">
    <label for="justify-content">justify-content:</label>
    <select name="justify-content" id="justify-content">
      <option value="normal">normal</option>
      <optgroup label="content-distribution">
        <option value="space-between">space-between</option>
        <option value="space-around">space-around</option>
        <option value="space-evenly">space-evenly</option>
        <option value="stretch">stretch</option>
      </optgroup>
      <optgroup label="overflow-position">
        <option value="unsafe">unsafe</option>
        <option value="safe">safe</option>
      </optgroup>
      <optgroup label="content-position">
        <option value="center">center</option>
        <option value="start">start</option>
        <option value="end">end</option>
        <option value="flex-start">flex-start</option>
        <option value="flex-end">flex-end</option>
      </optgroup>
      <option value="left">left</option>
      <option value="right">right</option>
    </select>
  </div>
  <div class="control">
    <label for="align-content">align-content:</label>
    <select name="align-content" id="align-content">
      <option value="normal">normal</option>
      <optgroup label="baseline-position">
        <option value="baseline">baseline</option>
        <option value="first baseline">first baseline</option>
        <option value="last baseline">last baseline</option>
      </optgroup>
      <optgroup label="content-distribution">
        <option value="space-between">space-between</option>
        <option value="space-around">space-around</option>
        <option value="space-evenly">space-evenly</option>
        <option value="stretch">stretch</option>
      </optgroup>
      <optgroup label="overflow-position">
        <option value="unsafe">unsafe</option>
        <option value="safe">safe</option>
      </optgroup>
      <optgroup label="content-position">
        <option value="center">center</option>
        <option value="start">start</option>
        <option value="end">end</option>
        <option value="flex-start">flex-start</option>
        <option value="flex-end">flex-end</option>
      </optgroup>
    </select>
  </div>
  <div class="control">
    <label for="align-tracks">align-tracks:</label>
    <select name="align-tracks" id="align-tracks">
      <option value="normal">normal</option>
      <optgroup label="baseline-position">
        <option value="baseline">baseline</option>
        <option value="first baseline">first baseline</option>
        <option value="last baseline">last baseline</option>
      </optgroup>
      <optgroup label="content-distribution">
        <option value="space-between">space-between</option>
        <option value="space-around">space-around</option>
        <option value="space-evenly">space-evenly</option>
        <option value="stretch">stretch</option>
      </optgroup>
      <optgroup label="overflow-position">
        <option value="unsafe">unsafe</option>
        <option value="safe">safe</option>
      </optgroup>
      <optgroup label="content-position">
        <option value="center">center</option>
        <option value="start">start</option>
        <option value="end">end</option>
        <option value="flex-start">flex-start</option>
        <option value="flex-end">flex-end</option>
      </optgroup>
    </select>
  </div>
</footer>
@import url("https://fonts.googleapis.com/css2?family=Exo:wght@600&display=swap");

* {
  box-sizing: border-box;
}

body {
  width: calc(100vw - 12px);
  min-height: calc(100vh - 12px);
  counter-reset: section;
  font-family: "Exo", Arial, sans-serif;
  font-size: 20px;
  font-weight: 600;
  padding: 10px;
  box-sizing: border-box;
  background-color: #222;
  border: 1px dashed #fff;
  margin: 5px;
}

.item {
  border-radius: 10px;
  background-size: cover;
  background-position: center;
  height: 10vh;
  position: relative;
  border: 1px solid rgba(255, 255, 255, 0.8);
}

.item::before {
  counter-increment: section;
  content: counter(section);
  background-image: radial-gradient(
      50% 105%,
      #fffff5 15%,
      #fff3d5 31%,
      #ffd484 100%
    ),
    radial-gradient(51% 200%, #fffcf5 100%, rgba(251, 213, 142, 0) 100%),
    radial-gradient(50% 103%, #ff5f49 15%, #ff1919 100%);
  background-origin: border-box;
  background-clip: padding-box, padding-box, border-box;
  border: 2px solid transparent;
  box-shadow: 0 2px 10px 0 rgba(96, 43, 43, 0.5);
  border-radius: 50%;
  padding: 5px;
  font-size: 1em;
  display: inline-flex;
  justify-content: center;
  align-items: center;
  position: absolute;
  right: 10px;
  bottom: 10px;
  color: #fff;
  text-shadow: 1px 0px 0 rgb(103 105 171), 0px 1px 0 rgb(221 17 17),
    -1px 0px 0 rgb(113 12 206), 0px -1px 0 rgb(207 107 225),
    2px 0px 0 rgb(103 105 171), 0px 2px 0 rgb(221 17 17),
    -2px 0px 0 rgb(113 12 206), 0px -2px 0 rgb(207 107 225);
  width: 32px;
  height: 32px;
  mix-blend-mode: difference;
  filter: hue-rotate(180deg);
  backdrop-filter: saturate(0.8);
}

.item:nth-child(2n) {
  height: 14vh;
}
.item:nth-child(3n) {
  height: 18vh;
}
.item:nth-child(4n) {
  height: 22vh;
}
.item:nth-child(5n) {
  height: 24vh;
}
.item:nth-child(6n) {
  height: 30vh;
}
.item:nth-child(7n) {
  height: 34vh;
}

.item:nth-child(8n) {
  height: 40vh;
}

footer {
  position: fixed;
  left: 0;
  right: 0;
  display: flex;
  justify-content: center;
  align-items: center;
  bottom: 0;
  z-index: 999;
  padding: 15px;
  background-color: rgba(0, 0, 0, 0.65);
  color: #fff;
}

footer label {
  margin: 0 5px;
}

:root {
  --justify-content: normal;
  --align-content: normal;
  --align-tracks: normal;
}

body {
  display: grid;
  grid-template-columns: repeat(4, 160px);
  grid-template-rows: masonry;
  gap: 10px;

  justify-content: var(--justify-content);
  align-content: var(--align-content);
  align-tracks: var(--align-tracks);
}
for (let i = 0; i <= 10; i++) {
  const div = document.createElement("div");
  div.classList.add("item");
  div.style.backgroundImage = `url(https://picsum.photos/500/500?random=${i})`;
  document.body.appendChild(div);
}

const rootElement = document.documentElement;

const selects = document.querySelectorAll("select");

selects.forEach((select) =>
  select.addEventListener("change", (e) => {
    rootElement.style.setProperty(`--${e.target.id}`, e.target.value);
  })
);
View Compiled

External CSS

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External JavaScript

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