* { margin: 0; padding: 0; box-sizing: border-box; }
html, body { width: 100%; height: 100%; overflow-x: hidden; }
html { font-size: 14px; }
body {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 100vh;
  padding: 25px;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Oxygen, Ubuntu, Cantarell, "Open Sans", "Helvetica Neue", sans-serif;
  font-size: 1rem;
  line-height: 1.2em;
  transition: background 0.3s, color 0.3s;
}
main { text-align: center; }
a { color: inherit; text-decoration: underline; }
a:hover { text-decoration: none; }