<section>
  <div class="grid__container">
    <div class="grid__item"></div>
    <div class="grid__item"></div>
    <div class="grid__item"></div>
    <div class="grid__item"></div>
    <div class="grid__item"></div>

    <div class="col-1 col">
      <label for="col-1">
        <output id="col-1-output">100</output>px
      </label>
      <input type="range" id="col-1" name="col" min="50" max="300" value="100" />

    </div>
    <div class="col-2 col">
      <label for="col-2">
        <output id="col-2-output">100</output>px
      </label>
      <input type="range" id="col-2" name="col" min="50" max="300" value="100" />

    </div>
    <div class="col-3 col">
      <label for="col-3">
        <output id="col-3-output">100</output>px
      </label>
      <input type="range" id="col-3" name="col" min="50" max="300" value="100" />

    </div>
    <div class="row-1 row">
      <label for="row-1">
        <output id="row-1-output">50</output>px
      </label>
      <input type="range" id="row-1" name="row" min="30" max="150" value="50" />
    </div>
    <div class="row-2 row">
      <label for="row-2">
        <output id="row-2-output">50</output>px
      </label>
      <input type="range" id="row-2" name="row" min="30" max="150" value="50" />
    </div>
    <div class="row-3 row">
      <label for="row-3">
        <output id="row-3-output">50</output>px
      </label>
      <input type="range" id="row-3" name="row" min="30" max="150" value="50" />
    </div>
  </div>
</section>

@import url("https://fonts.googleapis.com/css2?family=Exo:wght@600&display=swap");

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

body {
  width: 100vw;
  min-height: 100vh;

  display: flex;
  justify-content: center;
  flex-direction: column;
  gap: 20px;
  font-family: "Exo", Arial, sans-serif;
  background-color: #f7f7f7;

  padding: 20px;
}

section {
  max-width: 80vw;
  width: 100%;
  margin: 0 auto;

  display: flex;
  justify-content: center;
  align-items: center;
}

.grid__container {
  border: 1px dashed #f36;
  box-shadow: 0 0 0 6px rgb(0 0 0 / 13%);
  border-radius: 1px;
}

.grid__item {
  display: flex;
  justify-content: center;
  align-items: center;
  padding: 10px;
  background-color: #f7f7f7;
  counter-increment: item;
}

.grid__item::before {
  content: counter(item);
  color: #fff;
  font-size: 2rem;
  text-shadow: 1px 1px 0 rgba(0 0 0 / 0.25);
}

.grid__item:nth-child(1) {
  background-color: #f1c2c6;
}

.grid__item:nth-child(2) {
  background-color: #dac2f1;
}

.grid__item:nth-child(3) {
  background-color: #ccf1c2;
}

.grid__item:nth-child(4) {
  background-color: #c2e9f1;
}

.grid__item:nth-child(5) {
  background-color: #f1ebc2;
}
.grid__item:nth-child(6) {
  background-color: #3f51b5;
}

.grid__item:nth-child(7) {
  background-color: #810d16;
}

.grid__item:nth-child(8) {
  background-color: #4d0d81;
}

.grid__item:nth-child(9) {
  background-color: #0d4e81;
}

.grid__item:nth-child(10) {
  background-color: #0d815f;
}
.grid__item:nth-child(11) {
  background-color: #2196f3;
}
.grid__item:nth-child(12) {
  background-color: #ff5722;
}

.grid__container {
  grid-template-columns: repeat(3, 150px);
  gap: 10px;
}

.grid__container > .grid__item:nth-child(1) {
  grid-area: 1 / 1 / 4 / 2;
}

.grid__container > .grid__item:nth-child(2) {
  grid-area: 1 / 2 / 2 / 4;
}

/* 
.grid__container::-webkit-scrollbar-track {
  box-shadow: inset 0 0 6px rgba(0, 0, 0, 0.9);
  border-radius: 10px;
  background-color: #444444;
}

.grid__container::-webkit-scrollbar {
  width: 6px;
  height: 6px;
  background-color: #f5f5f5;
}

.grid__container::-webkit-scrollbar-thumb {
  border-radius: 10px;
  background-color: #d62929;
  background-image: linear-gradient(
    90deg,
    transparent,
    rgba(0, 0, 0, 0.4) 50%,
    transparent,
    transparent
  );
} */

.grid__container {
  --col-1: 100;
  --col-2: 100;
  --col-3: 100;
  --row-1: 50;
  --row-2: 50;
  --row-3: 50;
  display: grid;
  grid-template-columns:
    calc(var(--col-1) * 1px)
    calc(var(--col-2) * 1px)
    calc(var(--col-3) * 1px);
  grid-template-rows:
    calc(var(--row-1) * 1px)
    calc(var(--row-2) * 1px)
    calc(var(--row-3) * 1px);
  gap: 10px;
  transition: all 0.28s linear;
  position: relative;
}

.col,
.row {
  position: absolute;
  display: inline-flex;
  flex-direction: column;
  align-items: center;
}

.col {
  bottom: calc(100% + 10px);
  width: 100px;
}
.row {
  left: calc(100% + 6px);
  writing-mode: vertical-rl;
  width: 50px;
}

.row-1 {
  top: 6px;
}

.row-2 {
  top: calc(var(--row-1) * 1px + 14px);
}

.row-3 {
  top: calc(var(--row-1) * 1px + var(--row-2) * 1px + 24px);
}
.col-1 {
  left: 0;
}
.col-2 {
  left: calc(var(--col-1) * 1px + 10px);
}
.col-3 {
  left: calc(var(--col-1) * 1px + var(--col-2) * 1px + 20px);
}

input[type="range"] {
  width: 100px;
}

.row input[type="range"] {
  transform: rotate(90deg);
  width: 50px;
  height: 20px;
  margin-right: -14px;
}

let inputRanges = document.querySelectorAll('input[type="range"]');
let gridContainer = document.querySelector(".grid__container");

inputRanges.forEach((input, index) => {
  input.addEventListener("click", (etv) => {
    gridContainer.style.setProperty(`--${etv.target.id}`, etv.target.value);
    document.getElementById(`${etv.target.id}-output`).textContent =
      etv.target.value;
  });
});