body{margin:0;font-family:Arial;background:#f4f4f4}
.topo{background:#222;color:#fff;padding:15px}
.topo nav a{color:#fff;margin-right:10px;text-decoration:none}
.bloco{background:#fff;margin:15px;padding:15px;border-radius:6px}
.card input{margin:5px}
button{padding:5px 10px}
footer{text-align:center;padding:10px;color:#555}