html, body { height: 100%; }

body > footer {
  position: sticky;
  top: 100vh;
  padding: 2rem 0 1rem 0;
}

a.flatmark-anchor {
    text-decoration: none;
    font-size: 0.8em;
    display: none;
}
h1:hover>a.flatmark-anchor,
h2:hover>a.flatmark-anchor,
h3:hover>a.flatmark-anchor,
h4:hover>a.flatmark-anchor,
h5:hover>a.flatmark-anchor,
h6:hover>a.flatmark-anchor {
    display: inline;
}