:root {
  --paper: #fff;
  --ink: #1a1a1a;
  --muted: #7b7b7b;
  --accent: #00bb00;
  --rule: #e5e0d5;
}

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

body {
  background: var(--paper);
  color: var(--ink);
  font: 17px/1.6 -apple-system, BlinkMacSystemFont, "Segoe UI", system-ui, sans-serif;
  max-width: 40rem;
  margin: 0 auto;
  padding: 4rem 1.5rem 6rem;
}

h1, h2, p, ul {
    margin: 1.5em 0;
}

h1 {
  font-size: 2rem;
  line-height: 1;
  font-weight: 700;
}

h2 {
  font-size: 1.5rem;
  font-weight: 500;
  color: var(--muted);
}

h1 + h2, h2 + p {
    margin-top: -1.8em;
}

hr {
  border: none;
  border-top: 1px solid var(--rule);
}

ul {
    list-style: none;
}

.center {
  text-align: center;
}

.button {
  display: inline-block;
  background: var(--accent);
  color: #fff;
  text-decoration: none;
  font-family: -apple-system, "Helvetica Neue", Helvetica, Arial, sans-serif;
  font-weight: 600;
  padding: 0.3rem 1.5rem;
  border-radius: 2em;
}

.button:hover {
    background: #c53030;
}

.small {
  margin-top: 0.9rem;
  font-size: 0.9rem;
}

.muted {
    color: var(--muted);
}

footer {
  font-size: 0.95rem;
  color: var(--muted);
  font-style: italic;
  text-align: center;
}

@media (max-width: 600px) {
  body {
    font-size: 18px;
  }
}