body {
    margin: 0;
    padding: 0 5em;
    line-height: 1.6;
    box-sizing: border-box;
}

h1, h2, h3 {
    line-height: 1.2;
}

header {
    padding: 1em 0;
}

nav ul {
    padding: 0 1em;
    margin: 0;
}

nav ul li a {
    text-decoration: none;
}

section {
    margin-bottom: 2em;
}

footer {
    text-align: center;
    padding: 1em 0;
    position: fixed;
    width: calc(100% - 40em);
    bottom: 0;
    left: 20em;
}