body{font-family:Arial,Helvetica,sans-serif;margin:0;color:#222}
header,footer{background:#0a7a4a;color:#fff;padding:20px}
nav a{color:#fff;margin-right:15px;text-decoration:none;font-weight:bold}
section{padding:40px}
h1{color:#0a7a4a}
.btn{display:inline-block;padding:12px 20px;background:#0a7a4a;color:#fff;text-decoration:none;border-radius:6px}