CODE EXAMPLE FOR HTML

how to show iframe in full width

<div>
  <div style="position:relative;padding-top:56.25%;">
    <iframe src="https://www.youtube.com/embed/nckseQJ1Nlg" frameborder="0" allowfullscreen
      style="position:absolute;top:0;left:0;width:100%;height:100%;"></iframe>
  </div>
</div>