html, body {
  width: 100%;
  height: 100%;
  margin: 0;
  background: #07152e;
  overflow: hidden;
}

.wallpaper {
  position: fixed;
  inset: 0;
  background-color: #07152e;
  background-image: url("wallpaper.png");
  background-position: center;
  background-repeat: no-repeat;
  background-size: auto 100%;
}

@media (orientation: portrait) and (max-width: 1024px),
       (orientation: portrait) and (hover: none) and (pointer: coarse) {
  .wallpaper {
    background-image: url("wallpaper-portrait.png");
  }
}