html{
  font-size: 20px;
}
body {
  margin: 0;
}
ul,
li {
  margin: 0;
  padding: 0;
  list-style: none;
}
.switcher {
  width: 100vw;
  height: 100vh;
  overflow: hidden;
}
.switcher li {
  width: 100vw;
  height: 100vh;
  overflow: hidden;
}
.switcher li:nth-of-type(2) {
  overflow-y: scroll;
}