html, body { min-height: 100%; }
body { min-height: 100vh; display: flex; flex-direction: column; margin: 0; }
main { flex: 1 0 auto; }
.site-header, .site-footer { flex: 0 0 auto; }
.skip-link {
  position: absolute;
  left: -10000px;
  top: auto;
  width: 1px;
  height: 1px;
  overflow: hidden;
}
.skip-link:focus {
  left: 1rem;
  top: 1rem;
  width: auto;
  height: auto;
  z-index: 10000;
  padding: .75rem 1rem;
  background: #fff;
  color: #000;
  border: 2px solid #000;
}