.c-video {
  width: 100%;
  max-width: 960px;
  margin: auto;
}

.c-video__placeholder{
  position: relative;
  height: 0;
  width: 100%;
  padding-bottom: 53.6%;
  background-color: palette('neutral', 100); 
}

.c-video__iframe{
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
}