<section>
  <div class="grid__container">
    <div class="grid__item"> 16 / 9 </div>
    <div class="grid__item"> 4 / 3 </div>
    <div class="grid__item"> 2 / 1 </div>
  </div>
  <form action="">
    <input type="range" min="0" max="100" value="100" />
  </form>
</section>

<div class="select">
  <label for="select">width:</label>
  <select name="select" id="width">
    <option value="auto">auto</option>
    <option value="min-content">min-content</option>
    <option value="max-content">max-content</option>
    <option value="fit-content">fit-content</option>
    <option value="50%">50%</option>
    <option value="10em">10em</option>
    <option value="300px">300px</option>
    <option value="fit-content(200px)">fit-content(200px)</option>
    <option value="min(100px, 20vh)">min(100px, 20vh)</option>
    <option value="max(20vh, 200px)">max(20vh, 200px)</option>
    <option value="clamp(100px, 30vh, 200px)">clamp(100px, 30vh, 200px)</option>
    <option value="30ch">30ch</option>
    <option value="30ex">30ex</option>
    <option value="20vh">20vh</option>
    <option value="10vw">10vw</option>
  </select>

  <label for="select">height:</label>
  <select name="select" id="height">
    <option value="auto">auto</option>
    <option value="min-content">min-content</option>
    <option value="max-content">max-content</option>
    <option value="fit-content">fit-content</option>
    <option value="50%">50%</option>
    <option value="10em">10em</option>
    <option value="300px">300px</option>
    <option value="fit-content(200px)">fit-content(200px)</option>
    <option value="min(100px, 20vh)">min(100px, 20vh)</option>
    <option value="max(20vh, 200px)">max(20vh, 200px)</option>
    <option value="clamp(100px, 30vh, 200px)">clamp(100px, 30vh, 200px)</option>
    <option value="30ch">30ch</option>
    <option value="30ex">30ex</option>
    <option value="20vh">20vh</option>
    <option value="10vw">10vw</option>
  </select>
</div>

@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 {
  margin: 0 auto;

  display: flex;
  flex-direction: column;
  box-shadow: 0 0 0 6px rgb(0 0 0 / 13%);
  border-radius: 3px;
  gap: 20px;
  min-width: 50vw;
}

.grid__item {
  display: flex;
  justify-content: center;
  align-items: center;
  background-color: #f7f7f7;
  position: relative;
}

.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: #f09;
}

.grid__item:nth-child(5) {
  background-color: #09f;
}

.grid__item:nth-child(6) {
  background-color: #90f;
}

form {
  width: 100%;
}
input[type="range"] {
  width: 100%;
}
.select {
  display: flex;
  justify-content: center;
  align-items: center;
  gap: 10px;
}
.grid__container {
  box-shadow: 0 0 0 2px red;
  border-radius: 2px;
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  --width: 100%;
  width: var(--width);
}

.grid__item:nth-child(1) {
  aspect-ratio: 16 / 9;
}

.grid__item:nth-child(2) {
  aspect-ratio: 4 / 3;
}

.grid__item:nth-child(3) {
  aspect-ratio: 2 / 1;
}

.grid__item {
  height: var(--item-width, auto);
  width: var(--item-height, auto);
}

const range = document.querySelector('input[type="range"]');
const container = document.querySelector(".grid__container");
const selects = document.querySelectorAll("select");
range.addEventListener("input", (etv) => {
  container.style.setProperty("--width", `${etv.target.value}%`);
});

selects.forEach((select) => {
  select.addEventListener("change", (etv) => {
    container.style.setProperty(`--item-${etv.target.id}`, etv.target.value);
  });
});