JSFiddle - React, Tailwind, and code Playground

HTML

<!DOCTYPE html>
<html>
<body>

<h1>The iframe element</h1>

<iframe class="custom" src="https://www.youtube.com/embed/OtVUZGhAHBc" title="lines on Iframe curves">
</iframe>

</body>
</html>

CSS

.custom {
    height: 360px;
    width: 640px;
    border-radius: 30px;
    border-width: 0;
}