body {
  background: black;
  color: white;
  font-family: sans-serif;
  margin: 0;
  text-align: center;
}
img { max-width: 100%; }
main { padding: 2rem; }
button, a {
  padding: 0.75rem 1.5rem;
  margin: 1rem 0.5rem;
  border-radius: 999px;
  text-decoration: none;
}
.buy { background: white; color: black; font-weight: bold; }
.copy { border: 1px solid white; color: white; background: transparent; }