@charset "utf-8";

body {
  margin: 0;
  padding: 0;
}
*, *::before, *::after {
  box-sizing: border-box;
}
h1, h2 {
  margin-block: 0;
}
ul {
  margin-block: 0;
  padding-left: 0;
  list-style: none;
}

:root {
  --header-height: 50px;
}
body {
  overflow: hidden;
}
.header {
  height: var(--header-height);
  color: white;
  background: black;
}
.nav {
  height: 100%;
}
.nav ul {
  display: flex;
  align-items: center;
  justify-content: center;
  height: 100%;
  gap: 20px;
}
.nav a {
  color: white;
  text-decoration: none;
}
.contents {
  height: calc(100dvh - var(--header-height));
  overflow-y: scroll;
  scroll-snap-type: y mandatory;
  scroll-behavior: smooth;
}
.section {
  scroll-snap-align: start;
  scroll-snap-stop: always;
  height: calc(100dvh - var(--header-height));
  display: flex;
  align-items: center;
  justify-content: center;
}

.section:nth-child(1) {background-color: tomato;}
.section:nth-child(2) {background-color: skyblue;}
.section:nth-child(3) {background-color: gold;}
.section:nth-child(4) {background-color: purple;}
.section:nth-child(5) {background-color: lime;}