footer {
  position: fixed;
  bottom: 0;
  width: 100%;
  padding-bottom: .25em;
  color: white;
  background: black;
  height: 2em;
  font-family: monospace;
  display: flex;
  justify-content: space-between;
  align-items: center;
}
footer > *:nth-child(1) {
  padding-left: 2ch;
}
footer > *:last-child {
  padding-right: 2ch;
}

footer a {
  filter: invert(90%);
  text-decoration: none;
}

footer a:hover {
  text-decoration: underline;
}