.cor-frame {
  --n: 9;
  --d: 16;
  padding-bottom: calc(var(--n) / var(--d) * 100%);
  position: relative;
}

.cor-frame > * {
  overflow: hidden;
  position: absolute;
  top: 0;
  right: 0;
  bottom: 0;
  left: 0;
  display: flex;
  justify-content: center;
  align-items: center;
}

.cor-frame > img,
.cor-frame > video {
  width: 100%;
  height: 100%;
  object-fit: cover;
}