body {
  margin: 0;
}
html {
  scroll-snap-type: y mandatory;
}

a {
  color: inherit;
}
body > div {
  padding: 2em;
  height: 100vh;
  scroll-snap-align: start;
  border: 1px solid silver;
  box-sizing: border-box;
  position: relative;
}
video {
  position: absolute;
  right: 0;
  bottom: 0;
  max-width: 30vw;
}