<iframe width="994" height="559" src="https://www.youtube.com/embed/3FY9G6mZJgE" frameborder="0" allow="accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture" allowfullscreen></iframe> code example
Example:
<iframe width="1012" height="569" src="https://www.youtube.com/embed/ScHI1cbkUv4" frameborder="0" allow="accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture" allowfullscreen></iframe>