/* estilos comuns, apenas para exemplo */

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

body {
  margin: 0;
  text-align: center;
  font-family: sans-serif;
}

nav {
  position: fixed;
  top: 0;
  width: 100%;
  background-color: #fff;
  z-index: 9;
  -webkit-backface-visibility: hidden;
}

nav ul {
  list-style: none;
  margin: 0;
  padding: 0;
}

nav ul li { display: inline-block; }

nav ul li a {
  text-decoration: none;
  padding: 10px;
  float: left;
  color: #2980b9;
}

h1 {
  font-size: 4em;
  margin: 0;
}

.page {
  color: #fff;
  min-height: 100vh;
  line-height: 100vh;
}

#section-1 { background-color: #3498db; }

#section-2 { background-color: #9b59b6; }

#section-3 { background-color: #1abc9c; }

#section-4 { background-color: #e67e22; }

/* estilos recomendados */

.page { display: none; }