saudade/style/menu.css

/*noinspection DuplicatedCode,CssUnresolvedCustomProperty*/
div#archive-menu {
  position: fixed;
  top: 20px;
  right: 20px;
  text-align: right;
  font-size: 16px !important;

  padding: 10px;
  overflow: hidden;

  height: unset;
  width: unset;

  max-width: 0;
  max-height: 0;
  transition: max-height 0.5s ease-out, max-width 0.5s ease-out;

  border: 1px solid var(--border-color, var(--color, black));
  background: var(--background-image, var(--background-color, white));
  background-attachment: fixed;
  color: var(--color, black);
}

div#archive-menu a {
  display: block;
  text-decoration: underline;
  visibility: hidden;
  transition: visibility 0s;
  color: var(--color, black);
}

div#archive-menu a:hover {
  text-decoration: underline;
  text-decoration-style: wavy;
  color: var(--color, black);
}

div#archive-menu #hrt {
  font-family: sans-serif !important;
  display: block;
  position: absolute;
  top: -1px;
  right: 5px;

  opacity: 100%;
  transition: opacity 0.5s ease-out;
}

div#archive-menu:hover {
  max-width: 200px;
  max-height: 200px;
  transition: max-height 0.5s ease-in, max-width 0.5s ease-in;
}

div#archive-menu:hover a {
  visibility: visible;
  transition-delay: 0.5s;
}

div#archive-menu:hover #hrt {
  opacity: 0;
  transition: opacity 0.5s ease-in;
}