body { font-family: sans-serif; margin: 0; padding: 0; }
header { background: #333; color: white; padding: 20px; text-align: center; }
.hero img { width: 100%; height: auto; }
.about, .cta, footer { padding: 20px; text-align: center; }
.btn { background: #ff6600; color: white; padding: 10px 20px; text-decoration: none; }