header, nav, footer {
    font-family: sans-serif;
}

header {
    color: #fff;
    text-align: center;
    background-color: #159957;
    padding: 1em;
}

header a {
    color: #fff;
}

header a:visited {
    color: #f0f0f0;
}

nav {
    display: flex;
    padding: 0.6em;
    background-color: #60f0a8;
}

nav a {
    text-decoration: none;
    padding: 0.2em 0.6em;
    margin-right: 1em;
}

nav a:hover {
    text-decoration: underline;
    background-color: #159957;
    color: #fff;
}

footer {
    padding: 1em;
    background-color: #dadada;
}

.page-content {
    padding: 2em;
}