* {
  box-sizing: border-box;
}

html, body {
  height: 100%;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Oxygen,
               Ubuntu, Cantarell, "Open Sans", "Helvetica Neue", sans-serif;
  background: #fafafa;
  color: #222;
  font-size: clamp(1rem, 1.1vw + 0.5rem, 1.2rem);
  line-height: 1.6;
}

main {
  max-width: 700px;
  width: 100%;
  margin: 2rem auto 0 auto;
  padding: 0 1rem;
}

footer {
  text-align: center;
  font-size: 0.8rem;
  color: #666; /* was #888 */
  padding: 1rem;
}

html, body {
  background: #111;
  color: #eee;
}

a, strong {
  color: #00ff88;
}

footer {
  color: #999;
}