html {
    scroll-behavior: smooth;
}
body {
    margin: 0;
    padding: 0;
    font-family: Arial, Helvetica, sans-serif;
}
h1 {
    margin: 100px;
    text-align: center;
    padding: 0;
}
nav {
    width: 100%;
    background: #262626;
    overflow: hidden;
    position: fixed;
    top: 0;
}
ul {
    padding: 0;
    margin: 0;
    list-style: none;
}
li {
    float: left;
}
a {
    padding: 20px;
    width: 100px;
    display: block;
    text-decoration: none;
    color: #fff;
    text-transform: uppercase;
    font-weight: bold;
}
#section1 {
    height: 100vh;
    background: pink;
    display: inline-block;
    width: 100%;
}
#section2 {
    height: 100vh;
    background: red;
    display: inline-block;
    width: 100%;
}
#section3 {
height: 100vh;
background: pink;
display: inline-block;
width: 100%;
}
#section4 {
    height: 100vh;
    background: green;
    display: inline-block;
    width: 100%;
}
#section5 {
    height: 100vh;
    background: blue;
    display: inline-block;
    width: 100%;
}