@media screen and (orientation: landscape) {
  body::after {
    content: "Landscape";
  }
}

@media screen and (orientation: portrait) {
  body::after {
    content: "Portrait";
  }
}

body {
  margin: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  height: 100vh;
  width: 100vw;
  font-size: 10vmax;
}