*,
*::before,
*::after { box-sizing: border-box; }

body {
  margin: 0;
  min-height: 100vh;
  min-height: 100dvh;
  display: flex;
  flex-direction: column;
  background: #fff;
  color: #6b7078;
  font: 16px/1.5 system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
}

main {
  flex: 1;
  display: grid;
  place-items: center;
  padding: 16px;
}

/* the logo is square: half the viewport width or height, whichever is smaller */
.logo {
  display: block;
  width: min(50vw, 50vh);
  height: auto;
  aspect-ratio: 1;
}

.site-footer {
  padding: 16px 16px 24px;
  text-align: center;
  font-size: 0.8rem;
}
.site-footer p { margin: 0 0 4px; }
.site-footer a { color: inherit; }
.site-footer .footnote { font-size: 0.72rem; opacity: 0.8; }