<section>
  <div class="grid__container">
    <div class="grid__item">Grid Item</div>
    Anonymous Item
    <div class="grid__item" style="float: left">Float Element</div>
  </div>
  <span>Inline Element</span>
</section>

<form action="">
  <span>display:</span>
  <label for="grid">
    <input type="radio" name="display" id="grid" checked />
    grid
  </label>
  <label for="inline-grid">
    <input type="radio" name="display" id="inline-grid" />
    inline-grid
  </label>
</form>

@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: 50vw;
  width: 100%;
  margin: 0 auto;
}

.grid__container {
  border: 1px dashed #f36;
  box-shadow: 0 0 0 6px rgb(0 0 0 / 13%);
  border-radius: 1px;
  font-size: 1.5rem;
  text-shadow: 1px 1px 0 rgba(0 0 0 / 0.25);
  margin: 10px;
}

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

.grid__container::before,
.grid__container::after {
  display: flex;
  justify-content: center;
  align-items: center;
  padding: 10px;
  color: #fff;
}

.grid__container::before {
  content: "Before Pseudo Element";
  background-color: #c2e9f1;
}
.grid__container::after {
  content: "Before Pseudo Element";
  background-color: #09f;
}

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

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

span {
  font-size: 1.2rem;
  margin: 0 10px;
}
form {
  display: flex;
  justify-content: center;
  align-items: center;
  padding-top: 20px;
  gap: 10px;
}

form label {
  display: inline-flex;
  align-items: center;
  gap: 5px;
}

.grid__container {
  --display: grid;
  display: var(--display);
}

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

inputs.forEach((input, index) => {
  input.addEventListener("click", (etv) => {
    gridContainer.style.setProperty("--display", etv.target.id);
  });
});