a {
    color: rgba(0,0,0,.65);
    text-decoration: none;
}
a:hover {
    text-decoration: underline;
    color: rgba(0,0,0,.65);
}
h2 {
    margin: 2rem 0 1.5rem;
    font-size: 1.5rem;
}
h3.explanation {
    margin: 2rem 0 1.5rem;
    font-size: 1.25rem;
}