body{font-family:Arial;margin:0;background:#f4f4f4;}
.topo{background:#0b3d2e;color:#fff;padding:15px;text-align:center;}
.menu{background:#145c44;padding:10px;text-align:center;}
.menu a{color:#fff;margin:0 10px;text-decoration:none;font-weight:bold;}
.conteudo{padding:20px;}
.card{background:#fff;padding:15px;margin:10px auto;max-width:600px;border-radius:6px;}