html, body { margin: 0; height: 100%; background: #000; color: #fff; font-family: Arial, sans-serif; }
iframe { border: 0; width: 100%; height: 100%; }
main { max-width: 28rem; margin: 0 auto; padding: 2rem 1.25rem; }
h1 { color: #e30613; font-size: 1.5rem; }
a, button { color: #fff; background: #e30613; border: 0; border-radius: 8px; padding: 0.75rem 1rem; font-weight: 700; }
label { display: block; margin: 0.75rem 0 0.25rem; }
input { width: 100%; padding: 0.6rem; box-sizing: border-box; }
p.note { color: #ccc; }