nav {
    background-color: #555;
}

nav ul {
    list-style: none;
    display: flex;
    /*justify-content: space-between;
    padding: 1em;*/
    padding: 10px;
}

nav a {
    color: #fff;
    text-decoration: none;
    padding: 0.5em;
}

nav a:hover {
    background-color: #fff;
    color: #333;
}

h1 {
    background-color: #ff0000;
}