html {
  height: -webkit-fill-available;
}

body {
  margin: 0;
  min-height: 100vh;
  min-height: -webkit-fill-available;
}

* {
  -webkit-box-sizing: border-box;
          box-sizing: border-box;
}

#app {
  width: 100vw;
  height: 100vh;
  margin-left: auto;
  margin-right: auto;
  overflow-x: hidden;
  overflow-y: scroll;
  position: relative;
  -ms-scroll-snap-type: y proximity;
      scroll-snap-type: y proximity;
  background-color: #121212;
}

.item {
  scroll-snap-align: start;
  scroll-snap-stop: normal;
  width: 100vw;
  height: 100vh;
  position: relative;
  color: #FFFFFF;
  background-color: #040404;
  display: -webkit-box;
  display: -ms-flexbox;
  display: flex;
  -webkit-box-orient: horizontal;
  -webkit-box-direction: normal;
      -ms-flex-direction: row;
          flex-direction: row;
  -webkit-box-pack: center;
      -ms-flex-pack: center;
          justify-content: center;
  -webkit-box-align: center;
      -ms-flex-align: center;
          align-items: center;
  padding: 10vh 0;
  background-image: var(--background);
  background-size: cover;
  background-position: center;
}
.item:nth-of-type(2n) {
  background-color: #242424;
}