/* A fine inner frame, above video content without intercepting player controls. */
#grid > .cell::after {
  content: "";
  position: absolute;
  inset: 2px;
  border: 1px solid rgba(255, 255, 255, 0.8);
  border-radius: 2px;
  box-sizing: border-box;
  pointer-events: none;
  z-index: 20;
}