HTML CSS JS

<button class="btnReload">Reload</button>
<iframe src="https://www.roboleary.net/demos/68sXqkhm/"></iframe>

button {
    display: block;
    padding: 0.2rem;
    margin: 0.2rem;
  }

  iframe {
    display: block;

    height: 400px;
    width: 98%;
    max-width: 400px;
    margin-inline: 1%;

    border: none;
  }

  body {
    height: 100dvh;
    margin: 0;

    display: grid;
    place-items: center;
  }

let iframe = document.querySelector("iframe");
  let reloadButton = document.querySelector(".btnReload");

  reloadButton.addEventListener("click", () => {
    iframe.src += "";
  });