nav {
    text-align: center;
}

a {
    color: #435de7;
    text-decoration: none;
}

a:hover {
    color: #0048ff;
    background-color: #d1e9ff;
}

a:active {
    color: #8400ff;
    background-color: #d1e9ff;
}

footer {
    text-align: center;
}