.field--name-field-media-googledocs 
 {
  overflow: hidden;

  padding-top: 72.7%;
  position: relative;
}

.field--name-field-media-googledocs iframe {
   border: 0;
   height: 100%;
   left: 0;
   position: absolute;
   top: 0;
   width: 100%;
}