<section>
  <div class="grid__container">
    <div class="grid__item" style="--aspect-ratio: 16 / 9"> 16 / 9 </div>
    <div class="grid__item" style="--aspect-ratio: 4 / 3;"> 4 / 3 </div>
    <div class="grid__item" style="--aspect-ratio: 2 / 1;"> 2 / 1 </div>
  </div>
  <form action="">
    <input type="range" min="0" max="100" value="100" />
  </form>
</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 {
  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;
  --width: 100%;
  width: var(--width);

  display: grid;
  grid-template-columns: repeat(3, 1fr);
  place-items: start;
}

.grid__item {
  width: 100%;
}

.grid__item::before {
  content: "";
  display: block;
  width: 1px;
  height: 0;
  padding-bottom: calc(100% / (var(--aspect-ratio)));
}

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