oembed.frame.css

iframe {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  margin: 0;
}

File

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core/modules/media/css/oembed.frame.css

View source 
  1. iframe {

  2.   position: absolute;

  3.   top: 0;

  4.   left: 0;

  5.   width: 100%;

  6.   height: 100%;

  7.   margin: 0;

  8. }

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