Layout 101

by Wentz Wu

HTML

<div id="wrapper">
  <iframe src="https://www.youtube.com/embed/TR6fCvd2BCs" frameborder="0" allowfullscreen></iframe>
</div>

CSS

#wrapper {
  box-sizing: border-box;
  width: 100vw;
  height: 100vh;
  border: 10px solid red;
  border-radius: 5px;
  margin: auto;
  position: absolute;
  left: 0;
  right: 0;
  top: 0;
  bottom: 0;
}

#wrapper iframe {
  width: 100%;
  height: 100%;
}