.github-link {
  position: fixed;
  top: 0;
  right: 0;
  height: 42px;
  aspect-ratio: 1/1;
  background: #000;
  opacity: 0.3;
}

.github-link::before {
  position: absolute;
  content: "";
  width: 100%;
  height: 400%;
  background: #000;
  transform: translate(0, -25%) rotate(-45deg);
}

.github-link::after {
  position: absolute;
  content: "";
  top: 6px;
  right: 6px;
  width: 100%;
  height: 100%;
  background: url(./../assets/img/github-mark-white.svg) no-repeat 0 0 / contain;
}