*, *::before, *::after { margin: 0; padding: 0; box-sizing: border-box; }

html, body {
  width: 100%; height: 100%;
  background: #000;
  overflow: hidden;
}

#wrapper {
  position: fixed;
  inset: 0;
}

video {
  width: 100%; height: 100%;
  object-fit: cover;
  display: block;
}

#overlay {
  position: absolute;
  inset: 0;
  width: 100%; height: 100%;
  pointer-events: none;
}

#flash {
  position: fixed;
  inset: 0;
  background: white;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.20s ease-in;
}
#flash.pop {
  opacity: 1;
  transition: none;
}