body{font-family:Arial,Helvetica,sans-serif;margin:0;padding:2maior 5%;background:#f5f5f5;color:#222}
header{background:#003366;color:#fff;padding:1rem;text-align:center}
h1{margin:0;font-size:1.4rem}
main{background:#fff;padding:1.5rem;border-radius:8px;max-width:600px;margin:auto}
ol{margin-left:1.2rem}
footer{text-align:center;margin-top:2rem;font-size:.8rem}